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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549



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FORM 10-K



|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

For the year ended December 31, 2005

Or



| ̈ | TRANSITION REPORT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | -------------------------------------------------------------------------------

For the transition period from  to

Commission File
No. 333-85994-01



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MEWBOURNE ENERGY PARTNERS 03-A, L.P.



|                                                         |  |                                        
|-------------------------------------------------------- |  | ---------------------------------------
|Delaware                                                 |  | 27-0055431                             
|(State or jurisdiction of incorporation or organization) |  | (I.R.S. Employer Identification Number)
|                                                         | 
|3901 South Broadway, Tyler, Texas                        |  | 75701                                  
|(Address of principal executive offices)                 |  | (Zip code)                             



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Registrants Telephone Number, including area code:

(903) 561-2900

Securities registered pursuant to Section 12(b) of the Act:

None.

Securities registered pursuant to Section 12(g) of the Act:

Limited and general partnership interest $1,000 per interest



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Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the
Securities Act.    Yes ̈No  x

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the
Act.    Yes ̈No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934
during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to
the best of the registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer or a non-accelerated filer. See definition
of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):



|                         |  |                    |  |                           
|------------------------ |  | ------------------ |  | --------------------------
|Large accelerated filer ̈ |  | Accelerated filer ̈ |  | Non-accelerated filer    x

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the
Act):    Yes ̈No  x

No market currently exists for the limited and general partnership interest of the registrant. Based on original purchase price the aggregate market value
of limited and general partnership interest owned by non-affiliates of the registrant is $18,000,000.

The following documents are
incorporated by reference into the indicated parts of this Annual Report on Form 10-K; Part of the information called for by Part IV of the Annual Report on Form 10-K is incorporated by reference from the Registrants Registration Statement on
Form S-1, File No. 333-85994-01.



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##### Table of Contents

TABLE OF CONTENTS



|                                             |  |                                                                                       |  |   
|-------------------------------------------- |  | ------------------------------------------------------------------------------------- |  | --
|PART I                                       |  |                                                                                       |  |   
|ITEM 1.                                      |  | Business                                                                              |  | 3 
|ITEM 2.                                      |  | Properties                                                                            |  | 4 
|ITEM 3.                                      |  | Legal Proceedings                                                                     |  | 4 
|ITEM 4.                                      |  | Submission of Matters to a Vote of Security Holders                                   |  | 4 
|PART II                                      |  |                                                                                       |  |   
|ITEM 5.                                      |  | Market for Registrants Common Equity and Related Stockholder Matters                 |  | 5 
|ITEM 6.                                      |  | Selected Financial Data                                                               |  | 5 
|ITEM 7.                                      |  | Managements Discussion and Analysis of Financial Condition and Results of Operations |  | 5 
|ITEM 8.                                      |  | Financial Statements and Supplementary Data                                           |  | 10
|ITEM 9.                                      |  | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure  |  | 10
|ITEM 9A.                                     |  | Controls and Procedures                                                               |  | 10
|PART III                                     |  |                                                                                       |  |   
|ITEM 10.                                     |  | Directors and Executive Officers of the Registrant                                    |  | 11
|ITEM 11.                                     |  | Executive Compensation                                                                |  | 13
|ITEM 12.                                     |  | Security Ownership of Certain Beneficial Owners and Management                        |  | 13
|ITEM 13.                                     |  | Certain Relationships and Related Transactions                                        |  | 13
|PART IV                                      |  |                                                                                       |  |   
|ITEM 14.                                     |  | Principal Accountant Fees and Services                                                |  | 14
|ITEM 15.                                     |  | Exhibits, Financial Statements, Financial Statement Schedules and Reports on Form 8-K |  | 14
|SIGNATURES                                   |  | 15                                                                                   
|INDEX TO EXHIBITS                            |  | 29                                                                                   
|Certification of CEO Pursuant to Section 302 |  |                                                                                      
|Certification of CFO Pursuant to Section 302 |  |                                                                                      
|Certification of CEO Pursuant to Section 906 |  |                                                                                      
|Certification of CFO Pursuant to Section 906 |  |                                                                                      



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##### Table of Contents

PART I

ITEM 1. Business

Mewbourne Energy Partners 03-A, L.P. (the Registrant or the
Partnership) is a limited partnership organized under the laws of the State of Delaware on February 19, 2003 (date of inception). Its managing general partner is Mewbourne Development Corporation, a Delaware corporation
(MD).

A Registration Statement was filed pursuant to the Securities Act of 1933, as amended, registering limited and general
partnership interests in a series of two Delaware limited partnerships formed under Mewbourne Energy 02-03 Drilling Programs. General and limited partnership interests were offered at $1,000 each. The maximum offering amount was $18,000,000 (18,000
interests) per partnership. The Registrant was declared effective by the Securities and Exchange Commission on May 16, 2003. On July 9, 2003, the offering of limited and general partnership interests in the Registrant was closed, with
interests aggregating $18,000,000 originally being sold to 710 subscribers of which $16,107,005 were sold to 644 subscribers as general partner interests and $1,892,995 were sold to 66 subscribers as limited partner interests.

The Registrant engages primarily in oil and gas development and production and is not involved in any other industry segment. See the selected financial
data in Item 6 and the financial statements in Item 8 of this report for a summary of the Registrants revenue, income and identifiable assets.

The sale of crude oil and natural gas produced by the Registrant will be affected by a number of factors that are beyond the Registrants control. These factors include the price of crude oil and natural gas, the
fluctuating supply of and demand for these products, competitive fuels, refining, transportation, extensive federal and state regulations governing the production and sale of crude oil and natural gas, and other competitive conditions. It is
impossible to predict with any certainty the future effect of these factors on the Registrant.

The Registrant does not have long-term
contracts with purchasers of its crude oil or natural gas. The market for crude oil is such that the Registrant anticipates it will be able to sell all the crude oil it can produce. Natural gas will be sold to local distribution companies, gas
marketers and end users on the spot market. The spot market reflects immediate sales of natural gas without long-term contractual commitments. The future market condition for natural gas cannot be predicted with any certainty, and the Registrant may
experience delays in marketing natural gas production and fluctuations in natural gas prices.

Many aspects of the Registrants
activities are highly competitive including, but not limited to, the acquisition of suitable drilling prospects and the procurement of drilling and related oil field equipment, and are subject to governmental regulation, both at Federal and state
levels. The Registrants ability to compete depends on its financial resources and on the managing general partners staff and facilities, none of which are significant in comparison with those of the oil and gas exploration, development
and production industry as a whole. Federal and state regulation of oil and gas operations generally includes drilling and spacing of wells on producing acreage, the imposition of maximum allowable production rates, the taxation of income and other
items, and the protection of the environment.



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##### Table of Contents

The Registrant does not have any employees of its own. MD is responsible for all management functions.
Mewbourne Oil Company (MOC), a wholly owned subsidiary of Mewbourne Holdings, Inc., which is also the parent of the Registrants managing general partner, has been appointed Program Manager and is responsible for activities in
accordance with a Drilling Program Agreement entered into by the Registrant, MD and MOC. At March 30, 2006, MOC employed 157 persons, many of whom dedicated a part of their time to the conduct of the Registrants business during the period
for which this report is filed.

The production of oil and gas is not considered subject to seasonal factors although the price received by
the Registrant for natural gas sales will generally tend to increase during the winter months. Order backlog is not pertinent to the Registrants business.

ITEM 2. Properties

The Registrants properties consist primarily of leasehold interests in properties
on which oil and gas wells-in-progress are located. Such property interests are often subject to landowner royalties, overriding royalties and other oil and gas leasehold interests.

Fractional working interests in developmental oil and gas prospects located primarily in the Anadarko Basin of Western Oklahoma, the Texas Panhandle, and
the Permian Basin of New Mexico and West Texas, were acquired by the Registrant, resulting in the Registrants participation in the drilling of oil and gas wells. At December 31, 2005, 65 wells had been drilled and were productive and 8
wells had been drilled and abandoned. The following table summarizes the Registrants drilling activity for the year ended December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through
December 31, 2003:



|                          |  |       |  |       |  |       |  |       |  |       |  |      
|------------------------- |  | ----- |  | ----- |  | ----- |  | ----- |  | ----- |  | -----
|                          |  | 2005  |  | 2004  |  | 2003 
|                          |  | Gross |  | Net   |  | Gross |  | Net   |  | Gross |  | Net  
|Development Wells         |  |       |  |       |  |       |  |       |  |       |  |      
|Oil and natural gas wells |  | 2     |  | 0.103 |  | 40    |  | 6.643 |  | 23    |  | 4.211
|Non-productive wells      |  | 1     |  | 0.035 |  | 0     |  | 0     |  | 7     |  | 1.542

Reserve estimates were prepared by Forrest A Garb & Associates, Inc., the
Registrants independent petroleum consultants, in accordance with guidelines established by the Securities and Exchange Commission.

ITEM 3. Legal Proceedings

The Registrant is not aware of any pending legal proceedings to which it is a
party.

ITEM 4. Submission of Matters to a Vote of Security Holders

No matter was submitted to a vote of security
holders during the period ended December 31, 2005 covered by this report.



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PART II

ITEM 5. Market for Registrants Common Equity and Related Stockholder Matters

At March 30, 2006,
the Registrant had 18,000 outstanding limited and general partnerships interests held of record by 710 subscribers. There is no established public or organized trading market for the limited and general partner interests.

Revenues which, in the sole judgment of the managing general partner, are not required to meet the Registrants obligations will be distributed to
the partners at least quarterly in accordance with the Registrants Partnership Agreement. Distributions made to limited and general partners during the years ended December 31, 2005 and 2004, and the period from February 19, 2003
(date of inception) through December 31, 2003 were $5,578,735, $4,746,991 and $180,000, respectively.

ITEM 6. Selected Financial Data

The following table sets forth selected financial data for the years ended
December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003:



|                                                                                            |  |      |            |      |   |            |  |   |           
|------------------------------------------------------------------------------------------- |  | ---- | ---------- | ---- | - | ---------- |  | - | ----------
|Operating results                                                                           |  | 2005 |            | 2004 |   | 2003      
|Oil and gas sales                                                                           |  | $    | 7,233,251  |      | $ | 7,458,796  |  | $ | 370,391   
|Net income                                                                                  |  | $    | 3,776,848  |      | $ | 3,492,274  |  | $ | 99,165    
|Basic and diluted net income per limited and general partner interests (18,000 outstanding) |  | $    | 209.82     |      | $ | 194.02     |  | $ | 5.51      
|                                                                                            |  |      |            |      |   |            |  |   |           
|At year-end:                                                                                |  |      |            |      |   |            |  |   |           
|Total Assets                                                                                |  | $    | 15,588,777 |      | $ | 17,370,937 |  | $ | 18,392,821
|Cash Distributions                                                                          |  | $    | 5,578,735  |      | $ | 4,746,991  |  | $ | 180,000   

ITEM 7. Managements Discussion and Analysis of Financial Condition and Results of Operations

General

The Registrant was organized as a Delaware limited partnership on February 19, 2003. The offering of limited and general
partnership interests began May 16, 2003 as a part of an offering registered under the name Mewbourne Energy Partners 02-03 Drilling Programs. The offering of limited and general partner interests in the Registrant concluded July 9, 2003,
with total investor partner contributions of $18,000,000.



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The Registrant was formed to engage primarily in the business of drilling development wells, to produce
and market crude oil and natural gas produced from such properties, to distribute any net proceeds from operations to the general and limited partners and to the extent necessary, acquire leases which contain drilling prospects. The economic life of
the Registrant depends on the period over which the Registrants oil and gas reserves are economically recoverable.

Results of Operations

The following table sets forth certain operating data for the years ended December 31, 2005, 2004 and the period from
February 19, 2003 (date of inception) through December 31, 2003:



|                  |  |      |           |      |   |           |  |   |        
|----------------- |  | ---- | --------- | ---- | - | --------- |  | - | -------
|                  |  | 2005 |           | 2004 |   | 2003     
|Oil and gas sales |  | $    | 7,233,251 |      | $ | 7,458,796 |  | $ | 370,391
|Barrels produced  |  |      | 11,502    |      |   | 18,591    |  |   | 1,457  
|Mcf produced      |  |      | 900,037   |      |   | 1,230,543 |  |   | 69,676 
|Average price/bbl |  | $    | 53.53     |      | $ | 39.05     |  | $ | 29.88  
|Average price/mcf |  | $    | 7.35      |      | $ | 5.47      |  | $ | 4.69   

Year ended December 31, 2005 compared to the year ended December 31, 2004

Oil and natural gas sales. As shown in the table above, total oil and gas sales decreased $225,545 (3.0%) for the year ended December 31,
2005 as compared to the year ended December 31, 2004. Of this decrease, $379,500 and $2,426,914, respectively, were related to decreases in volumes of oil and gas sold. Volumes of oil and gas sold decreased 7,089 bbls of oil and 330,506 mcf of
gas for the year ended December 31, 2005 as compared to the year ended December 31, 2004. The decrease in volumes of oil sold was primarily due to a substantial decline in the production of three wells partially offset by (i) the
addition of two new wells and (ii) the substantial increase in the production of one well added in the fourth quarter of 2004. The decrease in volumes of gas sold was primarily due to (i) normal declines in production and (ii) a
substantial decline in the production of one well partially offset by the addition of two new wells. The wells with a substantial decline in production are not expected to return to previous levels of production. These decreases were partially
offset by increases of $269,115 and $2,311,754, respectively, related to increases in the average prices of oil and gas sold. Average oil and gas prices increased to $53.53 per bbl and $7.35 per mcf for the year ended December 31, 2005 from
$39.05 per bbl and $5.47 per mcf for the year ended December 31, 2004.

Interest income.Interest income decreased from $20,301
in 2004 to $2,325 in 2005 due to expenditures for the drilling of oil and gas wells, which resulted in a decrease of capital available for investments.

Lease operating expense and production taxes. Lease operating expense increased from $403,211 in 2004 to $563,716 in 2005. Lease operating expense increased primarily due to the addition of two new wells and
the workover and repair of three wells during the period ended December 31, 2005. Production taxes decreased from $593,726 in 2004 to $576,687 in 2005. Production taxes decreased due to decreased oil and gas revenues for 2005.

Depreciation, depletion and amortization. Depreciation, depletion and amortization decreased from $2,739,865 in 2004 to $2,052,840 in 2005. The
decrease is primarily due to the decline in production volumes. There were no cost ceiling write-downs for 2005 or 2004.



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Year ended December 31, 2004 compared to the period from February 19, 2003 (date of inception)
through December 31, 2003

Oil and natural gas sales. Oil and natural gas sales increased to $7,458,796 in 2004 from $370,391
in 2003 due to additional wells being drilled and completed by the Partnership during 2004, which resulted in a substantial increase in sales revenues and production volumes. Production volumes increased to 1,230,543 Mcf of gas in 2004 from 69,676
Mcf in 2003, while oil volumes increased to 18,591 Bbls in 2004 from 1,457 Bbls in 2003.

Interest income. Interest income decreased
from $49,791 in 2003 to $20,301 in 2004 due to expenditures for the drilling of oil and gas wells, which resulted in a decrease of capital available for investments.

Lease operating expense and production taxes. Lease operating expense increased from $22,525 in 2003 to $403,211 in 2004. Production taxes increased from $27,668 in 2003 to $593,726 in 2004. These expenses
increased as additional wells were drilled and completed in 2004.

Depreciation, depletion and amortization. Depreciation, depletion
and amortization increased from $173,088 in 2003 to $2,739,865 in 2004 as additional wells were drilled and producing, therefore depleting reserves.

Cost ceiling write-downs. There was a cost ceiling write-down for the year ended December 31, 2003 of $83,646, while at December 31, 2004 there was no cost ceiling write-down.

Liquidity and capital resources

Net cash
decreased by $2,612 during the year ended December 31, 2005. Cash flows from operating activities were utilized primarily for cash distributions to partners. All wells for which funds have been committed have been drilled. Any incidental future
capital expenditures incurred will be paid with revenues generated through oil and gas sales. Revenues which, in the sole judgment of the managing general partner, are not required to meet the Registrants obligations will be distributed to the
partners at least quarterly in accordance with the Registrants Partnership Agreement.

Critical Accounting Policies

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions
that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results
could differ from those estimates.

Significant estimates inherent in the Registrants financial statements include the estimate of
oil and gas reserves and future abandonment costs as reported in the footnotes to the financial statements. Changes in oil and gas prices and the changes in production estimates could have a significant effect on reserve estimates. The reserve
estimates directly impact the computation of depreciation, depletion, and amortization, asset retirement obligation, and the ceiling test for the Registrants oil and gas properties.



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The Registrant follows the full-cost method of accounting for its oil and gas activities. Under the
full-cost method, all productive and non-productive costs incurred in the acquisition, exploration and development of oil and gas properties are capitalized. Depreciation, depletion and amortization of oil and gas properties subject to amortization
is computed on the units-of-production method based on the proved reserves underlying the oil and gas properties. Oil and gas properties are subject to a quarterly ceiling test that limits such costs to the aggregate of the present value of future
net cash flows of proved reserves and the lower of cost or fair value of unproved properties. The present value of future net cash flows has been prepared assuming year-end selling prices, year-end development and production costs and a 10 percent
annual discount rate.

All financing activities of the Registrant are reported in the financial statements. The Registrant does not engage
in any off-balance sheet financing arrangements.

Asset Retirement Obligations

In accordance with FAS 143, the Partnership has recognized an estimated liability for future plugging and abandonment costs. The estimated liability is
based on historical experience and estimated well life. The liability is discounted using the credit-adjusted risk-free rate. Revisions to the liability could occur due to changes in well plugging and abandonment costs or well useful lives, or if
federal or state regulators enact new well restoration requirements. The Partnership recognizes accretion expense in connection with the discounted liability over the remaining life of the well.

A reconciliation of the Partnerships liability for well plugging and abandonment costs for the years ended December 31, 2005 and 2004, is as
follows:



|                               |  |      |         |   |      |   |        
|------------------------------ |  | ---- | ------- | - | ---- | - | -------
|                               |  | 2005 |         |   | 2004
|Balance, beginning of period   |  | $    | 379,022 |   |      | $ | 145,139
|Sale of oil and gas properties |  |      | (4,950  | ) |      |   | 0      
|Liabilities incurred           |  |      | 2,905   |   |      |   | 209,842
|Accretion expense              |  |      | 16,111  |   |      |   | 24,041 
|                               |  |      |         |   |      |   |        
|Balance, end of period         |  | $    | 393,088 |   |      | $ | 379,022
|                               |  |      |         |   |      |   |        



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Organization and Related Party Transactions

The Partnership was organized on February 19, 2003. Mewbourne Development Corporation (MD) is managing general partner and Mewbourne Oil Company
(MOC) is operator of oil and gas properties owned by the Partnership. Mewbourne Holdings, Inc. is the parent of both MD and MOC. Substantially all transactions are with MD and MOC.

In the ordinary course of business, MOC will incur certain costs that will be passed on to well owners of the well for which the costs were incurred. The
partnership will receive their portion of these costs based upon their ownership in each well incurring the costs. These costs are referred to as operator charges and are standard and customary in the oil and gas industry. Operator charges include
recovery of gas marketing costs, fixed rate overhead, supervision, pumping, and equipment furnished by the operator. Reimbursement to MOC for operator charges totaled $271,919, $834,580 and $389,778 for the years ended December 31, 2005 and
2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003, respectively. Operator charges are billed in accordance with the program and partnership agreements.

In general, during any particular calendar year, the total amount of administrative expenses allocated to the Partnership by MOC shall not exceed the
greater of (a) 3.5% of the Partnerships gross revenue from the sale of oil and natural gas production during each year (calculated without any deduction for operating costs or other costs and expenses) or (b) the sum of $50,000 plus
..25% of the capital contributions of limited and general partners. Under this arrangement, $244,840, 201,067 and $654 were allocated to the Partnership during the years ended December 31, 2005 and 2004, and for the period from February 19,
2003 (date of inception) through December 31, 2003, respectively.

The Partnership participates in oil and gas activities through a
Drilling Program Agreement (the Program). The Partnership and MD are parties to the Program. The costs and revenues of the Program are allocated to MD and the Partnership as follows:



|                                                                                                       |  |             |   |  |     |  
|------------------------------------------------------------------------------------------------------ |  | ----------- | - |  | --- | -
|                                                                                                       |  | Partnership |   |  | MD  |  
|Revenues:                                                                                              |  |             |   |  |     |  
|Proceeds from disposition of depreciable and depletable properties                                     |  | 60          | % |  | 40  | %
|All other revenues                                                                                     |  | 60          | % |  | 40  | %
|Costs and expenses:                                                                                    |  |             |   |  |     |  
|Organization and offering costs(1)                                                                     |  | 0           | % |  | 100 | %
|Lease acquisition costs(1)                                                                             |  | 0           | % |  | 100 | %
|Tangible and intangible drilling costs(1)                                                              |  | 100         | % |  | 0   | %
|Operating costs, reporting and legal expenses, general and administrative expenses and all other costs |  | 60          | % |  | 40  | %

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|(1) | As noted above, pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which approximate 30% of total capital costs. To the
extent that organization and offering costs and lease acquisition costs are less than 30% of total capital costs, MD is responsible for tangible drilling costs until its share of the Programs total capital costs reaches approximately 30%.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The Partnerships financial statements reflect its respective proportionate interest in the Program.



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ITEM 8. Financial Statements and Supplementary Data

The required financial statements of the Registrant
are contained in a separate section of this report following the signature attestation. See Item 15. Exhibits, Financial Statement Schedules and Reports on Form 8-K.

ITEM 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

ITEM 9A. Controls and Procedures

MD maintains a system of controls and procedures designed to provide
reasonable assurance as to the reliability of the financial statements and other disclosures included in this report, as well as to safeguard assets from unauthorized use or disposition. Within 90 days prior to the filing of this report, MDs
Chief Executive Officer and Chief Financial Officer have evaluated the effectiveness of the design and operation of its disclosure controls and procedures with the assistance and participation of other members of management. Based upon that
evaluation, MDs Chief Executive Officer and Chief Financial Officer concluded that its disclosure controls and procedures are effective for gathering, analyzing and disclosing the information the Partnership is required to disclose in
the reports it files under the Securities Exchange Act of 1934 within the time periods specified in the SECs rules and forms. There have been no significant changes in MDs internal controls or in other factors which could significantly
affect internal controls subsequent to the date MD carried out its evaluation.



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PART III

ITEM 10. Directors and Executive Officers of the Registrant

The Registrant does not have any officers or
directors. Under the Registrants Partnership Agreement, the Registrants managing partner, MD, is granted the exclusive right and full authority to manage, control and administer the Registrants business. MD is a wholly owned
subsidiary of Mewbourne Holdings, Inc.

Set forth below are the names, ages and positions of the directors and executive officers of MD,
the Registrants managing general partner. Directors of MD are elected to serve until the next annual meeting of stockholders or until their successors are elected and qualified.



|                    |  |                           |  |                                           
|------------------- |  | ------------------------- |  | ------------------------------------------
|Name                |  | Age as ofDecember 31,2005 |  | Position                                  
|Curtis W. Mewbourne |  | 70                        |  | President and Director                    
|                    |  |                          
|J. Roe Buckley      |  | 43                        |  | Vice President and Chief Financial Officer
|                    |  |                          
|Alan Clark          |  | 53                        |  | Treasurer                                 
|                    |  |                          
|Michael F. Shepard  |  | 59                        |  | Secretary and General Counsel             
|                    |  |                          
|Dorothy M. Cuenod   |  | 45                        |  | Assistant Secretary and Director          
|                    |  |                          
|Ruth M. Buckley     |  | 44                        |  | Assistant Secretary and Director          
|                    |  |                          
|Julie M. Greene     |  | 42                        |  | Assistant Secretary and Director          



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Curtis W. Mewbourne, age 70, formed Mewbourne Holdings, Inc. in 1965 and serves as Chairman of the
Board and President of Mewbourne Holdings, Inc., MD and MOC. He has operated as an independent oil and gas producer for the past 41 years. Mr. Mewbourne received a Bachelor of Science Degree in Petroleum Engineering from the University of
Oklahoma in 1957. Mr. Mewbourne is the father of Dorothy M. Cuenod, Ruth M. Buckley, and Julie M. Greene and the father-in-law of J. Roe Buckley.

J. Roe Buckley, age 43, joined Mewbourne Holdings, Inc. in July, 1990 and serves as Vice President and Chief Financial Officer of both MD and MOC. Mr. Buckley was employed by Mbank Dallas from 1985 to 1990
where he served as a commercial loan officer. He received a Bachelor of Arts in Economics from Sewanee in 1984. Mr. Buckley is the son-in-law of Curtis W. Mewbourne and is married to Ruth M. Buckley. He is also the brother-in-law of Dorothy M.
Cuenod and Julie M. Greene.

Alan Clark, age 53, joined MOC in 1979 and serves as Treasurer and Controller of both MD and MOC. Prior
to joining MOC, Mr. Clark was employed by Texas Oil and Gas Corporation as Assistant Supervisor of joint interest accounting from 1976 to 1979. Mr. Clark has served in several accounting/finance positions with MOC prior to his current
assignment. Mr. Clark received a Bachelor of Business Administration from the University of Texas at Arlington.

Michael F.
Shepard, age 59, joined MOC in 1986 and serves as Secretary and General Counsel of MD. He has practiced law exclusively in the oil and gas industry since 1979 and formerly was counsel with Parker Drilling Company and its Perry Gas subsidiary for
seven years. Mr. Shepard holds the Juris Doctor degree from the University of Tulsa where he received the National Energy Law and Policy Institute award as the outstanding graduate in the Energy Law curriculum. He received a B.A. degree, magna
cum laude, from the University of Massachusetts in 1976. Mr. Shepard is a member of the bar in Texas and Oklahoma.

Dorothy M.
Cuenod, age 45, received a B.A. degree in Art History from The University of Texas and a Masters of Business Administration Degree from Southern Methodist University. Since 1984 she has served as a Director and Assistant Secretary of both MD and
MOC. Ms. Cuenod is the daughter of Curtis W. Mewbourne and is the sister of Ruth M. Buckley and Julie M. Greene. She is also the sister-in-law of J. Roe Buckley.

Ruth M. Buckley, age 44, received a Bachelor of Science Degree in both Engineering and Geology from Vanderbilt University. Since 1987 she has served as a Director and Assistant Secretary of both MD and MOC.
Ms. Buckley is the daughter of Curtis W. Mewbourne and is the sister of Dorothy M. Cuenod and Julie M. Greene. She is also the wife of J. Roe Buckley.

Julie M. Greene, age 42, received a B.A. degree in Business Administration from The University of Oklahoma. Since 1988 she has served as a Director and Assistant Secretary of both MD and MOC. Prior to that time
she was employed by Rauscher, Pierce, Refsnes, Inc. Ms. Greene is the daughter of Curtis W. Mewbourne and is the sister of Dorothy M. Cuenod and Ruth M. Buckley. She is also the sister-in-law of J. Roe Buckley.

The organizational structure of the Partnership does not provide for an audit committee and therefore the Partnership does not have an audit committee or
financial expert serving in such capacity.



12



---

##### Table of Contents

ITEM 11. Executive Compensation

The Registrant does not have any officers or directors. Management of the
Registrant is vested in the managing general partner. None of the officers or directors of MD or MOC will receive remuneration directly from the Registrant, but will continue to be compensated by their present employers. The Registrant will
reimburse MD and MOC and affiliates thereof for certain costs of overhead falling within the definition of Administrative Costs, including without limitation, salaries of the officers and employees of MD and MOC; provided that no portion of the
salaries of the directors or of the executive officer of MOC or MD may be reimbursed as Administrative Costs.

ITEM 12. Security Ownership of Certain Beneficial Owners and Management

(a) Beneficial owners of more than five
percent



|               |  |                        |  |                                     |  |               
|-------------- |  | ---------------------- |  | ----------------------------------- |  | --------------
|Title of Class |  | Name ofBeneficialOwner |  | Amount  &  Natureof
BeneficialOwner |  | PercentofClass
|None           |  | None                   |  | N/A                                 |  | N/A           

(b) Security ownership of management

The Registrant does not have any officers or directors. The managing general partner of the Registrant, MD, has the exclusive right and full authority to
manage, control and administer the Registrants business. Under the Registrants Partnership Agreement, limited and general partners holding a majority of the outstanding limited and general partnership interests have the right to take
certain actions, including the removal of the managing general partner. The Registrant is not aware of any current arrangement or activity that may lead to such removal.

ITEM 13. Certain Relationships and Related Transactions

Transactions with MD and its affiliates

Pursuant to the Registrants Partnership Agreement, the Registrant had the following related party transactions with MD and its affiliates during
the years ended December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003:



|                                                                                                                                               |  |      |         |      |   |           |  |   |        
|---------------------------------------------------------------------------------------------------------------------------------------------- |  | ---- | ------- | ---- | - | --------- |  | - | -------
|                                                                                                                                               |  | 2005 |         | 2004 |   | 2003     
|Administrative & general expense and payment of well charges and supervision charges in accordance with standard industry operating
agreements |  | $    | 516,759 |      | $ | 1,035,647 |  | $ | 390,432

The Registrant participates in oil and gas activities through a drilling program created by the
Program. Pursuant to the Program, MD pays approximately 30% of the Programs capital expenditures and approximately 40% of its operating and general and administrative expenses. The Registrant pays the remainder of the costs and expenses of the
Program. In return, MD is allocated approximately 40% of the Programs revenues.



13



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##### Table of Contents

PART IV

ITEM 14. Principal Accountant Fees and Services



|         |  |                                  |        |      |   |        |  |   |       
|-------- |  | -------------------------------- | ------ | ---- | - | ------ |  | - | ------
|         |  | For the Year Ended December, 31,
|         |  | 2005                             |        | 2004 |   | 2003  
|Audit    |  | $                                | 30,814 |      | $ | 20,777 |  | $ | 13,785
|Tax Fees |  | $                                | 3,500  |      | $ | 4,454  |  | $ | 4,756 
|         |  |                                  |        |      |   |        |  |   |       
|         |  | $                                | 34,314 |      | $ | 25,231 |  | $ | 18,541
|         |  |                                  |        |      |   |        |  |   |       

The Partnership has retained PricewaterhouseCoopers LLP as their independent registered public
accounting firm.

ITEM 15. Exhibits, Financial Statements, Financial Statement Schedules and Reports on Form 8-K

(a) 1. Financial
statements

The following are filed as part of this annual report:

Report of Independent Registered Public Accounting Firm

Balance sheets as of December 31, 2005 and 2004

Statements of operations for the years ended December 31, 2005 and 2004, and for the period from February 19, 2003 (date of
inception) through December 31, 2003

Statements of changes in partners capital for the years ended
December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003

Statements of cash flows for the years ended December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003

Notes to financial statements

2.
Financial statement schedules

None.

All required information is in the financial statements or the notes thereto, or is not applicable or required.

3.
Exhibits

The exhibits listed on the accompanying index are filed or incorporated by reference as part of this annual report.

(b) Reports on Form 8-K

None.



14



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##### Table of Contents

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of
1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.



Mewbourne Energy Partners 03-A, L.P.By:

Mewbourne Development CorporationManaging General Partner




By:

/s/ Curtis W. MewbourneCurtis W. Mewbourne President and Director (Principal Executive Officer)


Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been
signed below by the following persons on behalf of the Registrant and in the capacities and on the date indicated.



|                                             |  |                                        |  |               
|-------------------------------------------- |  | -------------------------------------- |  | --------------
|                                             |  |                                       
|/s/ Curtis W. Mewbourne  Curtis W.
Mewbourne |  | President/Director                     |  | March 30, 2006
|                                             |  |                                       
|/s/ J. Roe Buckley  J. Roe
Buckley           |  | Vice President Chief Financial Officer |  | March 30, 2006
|                                             |  |                                       
|/s/ Alan Clark  Alan Clark                   |  | Treasurer                              |  | March 30, 2006
|                                             |  |                                       
|/s/ Dorothy M. Cuenod  Dorothy M.
Cuenod     |  | Director                               |  | March 30, 2006
|                                             |  |                                       
|/s/ Ruth M. Buckley  Ruth M.
Buckley         |  | Director                               |  | March 30, 2006
|                                             |  |                                       
|/s/ Julie M. Greene  Julie M.
Greene         |  | Director                               |  | March 30, 2006

Supplemental Information to be Furnished With Reports Filed Pursuant to Section 15(d) of
the Act by Registrants Which Have Not Registered Securities Pursuant to Section 12 of the Act

No annual report or proxy material
has been sent to the Registrants security holders.



15



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##### Table of Contents

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

FINANCIAL STATEMENTS

WITH REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING
FIRM

For the years ended December 31, 2005 and 2004, and for the period from

February 19, 2003 (date of inception) through December 31, 2003



16



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##### Table of Contents

Report of Independent Registered Public Accounting Firm

To the Partners of Mewbourne Energy Partners 03-A, L.P. and to the Board of Directors of Mewbourne Development Corporation:

In our opinion, the accompanying balance sheets and the related statements of operations, of changes in partners capital and of cash flows
present fairly, in all material respects, the financial position of Mewbourne Energy Partners 03-A, L.P. at December 31, 2005 and 2004 and the results of its operations and its cash flows for each of the two years in the period ended
December 31, 2005, and for the period from February 19, 2003 (date of inception) through December 31, 2003, in conformity with accounting principles generally accepted in the United States of America. These financial statements are
the responsibility of the Companys management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audits of these statements in accordance with the standards of the Public Company
Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test
basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that
our audits provide a reasonable basis for our opinion.

/s/ PricewaterhouseCoopers LLP

Dallas, Texas

March 31, 2006



17



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##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

BALANCE SHEETS

December 31, 2005 and 2004



|                                                                      |  |      |            |   |      |   |            |  
|--------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                                                      |  | 2005 |            |   | 2004 |  
|ASSETS                                                                |  |      |            |   |      |   |            |  
|Cash and cash equivalents                                             |  | $    | 1,040      |   |      | $ | 3,652      |  
|Accounts receivable, affiliate                                        |  |      | 1,430,737  |   |      |   | 1,689,796  |  
|Accounts receivable, other                                            |  |      | 0          |   |      |   | 33         |  
|                                                                      |  |      |            |   |      |   |            |  
|Total current assets                                                  |  |      | 1,431,777  |   |      |   | 1,693,481  |  
|                                                                      |  |      |            |   |      |   |            |  
|Prepaid well costs                                                    |  |      | 0          |   |      |   | 45,685     |  
|Oil and gas properties at cost, full cost method                      |  |      | 19,206,439 |   |      |   | 18,628,370 |  
|Less accumulated depreciation, depletion, amortization and impairment |  |      | (5,049,439 | ) |      |   | (2,996,599 | )
|                                                                      |  |      |            |   |      |   |            |  
|                                                                      |  |      | 14,157,000 |   |      |   | 15,631,771 |  
|                                                                      |  |      |            |   |      |   |            |  
|Total assets                                                          |  | $    | 15,588,777 |   |      | $ | 17,370,937 |  
|                                                                      |  |      |            |   |      |   |            |  
|LIABILITIES AND PARTNERS CAPITAL                                     |  |      |            |   |      |   |            |  
|Accounts payable, affiliate                                           |  | $    | 333,128    |   |      | $ | 327,467    |  
|                                                                      |  |      |            |   |      |   |            |  
|Asset retirement obligation plugging liability                        |  |      | 393,088    |   |      |   | 379,022    |  
|                                                                      |  |      |            |   |      |   |            |  
|Partners capital                                                     |  |      |            |   |      |   |            |  
|General partners                                                      |  |      | 0          |   |      |   | 14,911,908 |  
|Limited partners                                                      |  |      | 14,862,561 |   |      |   | 1,752,540  |  
|                                                                      |  |      |            |   |      |   |            |  
|Total partners capital                                               |  |      | 14,862,561 |   |      |   | 16,664,448 |  
|                                                                      |  |      |            |   |      |   |            |  
|Total liabilities and partners capital                               |  | $    | 15,588,777 |   |      | $ | 17,370,937 |  
|                                                                      |  |      |            |   |      |   |            |  



The accompanying notes are an
integral part of the financial statements.



18



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

STATEMENTS OF OPERATIONS

For the years ended December 31, 2005 and 2004,
and for the period from February 19, 2003 (date of inception) through December 31, 2003



|                                                                                                     |  |      |           |      |   |           |  |   |        
|---------------------------------------------------------------------------------------------------- |  | ---- | --------- | ---- | - | --------- |  | - | -------
|                                                                                                     |  | 2005 |           | 2004 |   | 2003     
|Revenues and other income:                                                                           |  |      |           |      |   |           |  |   |        
|Oil and gas sales                                                                                    |  | $    | 7,233,251 |      | $ | 7,458,796 |  | $ | 370,391
|Interest income                                                                                      |  |      | 2,325     |      |   | 20,301    |  |   | 49,791 
|                                                                                                     |  |      |           |      |   |           |  |   |        
|                                                                                                     |  |      | 7,235,576 |      |   | 7,479,097 |  |   | 420,182
|                                                                                                     |  |      |           |      |   |           |  |   |        
|Expenses:                                                                                            |  |      |           |      |   |           |  |   |        
|Lease operating expense                                                                              |  |      | 563,716   |      |   | 403,211   |  |   | 22,525 
|Production taxes                                                                                     |  |      | 576,687   |      |   | 593,726   |  |   | 27,668 
|Administrative and general expense                                                                   |  |      | 249,374   |      |   | 225,980   |  |   | 5,371  
|Depreciation, depletion, and amortization                                                            |  |      | 2,052,840 |      |   | 2,739,865 |  |   | 173,088
|Cost ceiling write-down                                                                              |  |      | 0         |      |   | 0         |  |   | 83,646 
|Asset retirement obligation accretion                                                                |  |      | 16,111    |      |   | 24,041    |  |   | 8,719  
|                                                                                                     |  |      |           |      |   |           |  |   |        
|                                                                                                     |  |      | 3,458,728 |      |   | 3,986,823 |  |   | 321,017
|                                                                                                     |  |      |           |      |   |           |  |   |        
|Net income                                                                                           |  | $    | 3,776,848 |      | $ | 3,492,274 |  | $ | 99,165 
|                                                                                                     |  |      |           |      |   |           |  |   |        
|Allocation of net income:                                                                            |  |      |           |      |   |           |  |   |        
|General partners                                                                                     |  | $    | 0         |      | $ | 3,125,003 |  | $ | 88,736 
|                                                                                                     |  |      |           |      |   |           |  |   |        
|Limited partners                                                                                     |  | $    | 3,776,848 |      | $ | 367,271   |  | $ | 10,429 
|                                                                                                     |  |      |           |      |   |           |  |   |        
|Basic and diluted net income per limited and general partner interest (18,000 interests outstanding) |  | $    | 209.82    |      | $ | 194.02    |  | $ | 5.51   
|                                                                                                     |  |      |           |      |   |           |  |   |        



The accompanying notes are an
integral part of the financial statements.



19



---

##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

STATEMENT OF CHANGES IN PARTNERS CAPITAL

For the years ended
December 31, 2005 and 2004, and for the period from

February 19, 2003 (date of inception) through December 31, 2003



|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|-------------------------------------------------------------------- |  | --------------- | ----------- | - | --------------- | - | ---------- | ----- |  | - | ---------- | -
|                                                                     |  | GeneralPartners |             |   | LimitedPartners |   |            | Total | 
|Balance at February 19, 2003                                         |  | $               | 0           |   |                 | $ | 0          |       |  | $ | 0          |  
|Capital contributions                                                |  |                 | 16,107,005  |   |                 |   | 1,892,995  |       |  |   | 18,000,000 |  
|Cash distributions                                                   |  |                 | (161,070    | ) |                 |   | (18,930    | )     |  |   | (180,000   | )
|Net income                                                           |  |                 | 88,736      |   |                 |   | 10,429     |       |  |   | 99,165     |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at December 31, 2003                                         |  | $               | 16,034,671  |   |                 | $ | 1,884,494  |       |  | $ | 17,919,165 |  
|Cash distributions                                                   |  |                 | (4,247,766  | ) |                 |   | (499,225   | )     |  |   | (4,746,991 | )
|Net income                                                           |  |                 | 3,125,003   |   |                 |   | 367,271    |       |  |   | 3,492,274  |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at December 31, 2004                                         |  | $               | 14,911,908  |   |                 | $ | 1,752,540  |       |  | $ | 16,664,448 |  
|Conversion of general partner interests to limited partner interests |  |                 | (14,911,908 | ) |                 |   | 14,911,908 |       |  |   | 0          |  
|Cash distributions                                                   |  |                 | 0           |   |                 |   | (5,578,735 | )     |  |   | (5,578,735 | )
|Net income                                                           |  |                 | 0           |   |                 |   | 3,776,848  |       |  |   | 3,776,848  |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at December 31, 2005                                         |  | $               | 0           |   |                 | $ | 14,862,561 |       |  | $ | 14,862,561 |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  



The accompanying notes are an
integral part of the financial statements.



20



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##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

STATEMENTS OF CASH FLOWS

For the years ended December 31, 2005 and 2004,
and for the period from

February 19, 2003 (date of inception) through December 31, 2003



|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|---------------------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | ---- |  | - | ----------- | -
|                                                                                                     |  | 2005 |            |   | 2004 |   |            | 2003 | 
|Cash flows from operating activities:                                                                |  |      |            |   |      |   |            |      |  |   |             |  
|Net income                                                                                           |  | $    | 3,776,848  |   |      | $ | 3,492,274  |      |  | $ | 99,165      |  
|Adjustment to reconcile net income to net cash provided by operating activities:                     |  |      |            |   |      |   |            |      |  |   |             |  
|Depreciation, depletion and amortization                                                             |  |      | 2,052,840  |   |      |   | 2,739,865  |      |  |   | 173,088     |  
|Cost ceiling write-down                                                                              |  |      | 0          |   |      |   | 0          |      |  |   | 83,646      |  
|Asset retirement obligation accretion                                                                |  |      | 16,111     |   |      |   | 24,041     |      |  |   | 8,719       |  
|Changes in operating assets and liabilities:                                                         |  |      |            |   |      |   |            |      |  |   |             |  
|Accounts receivable, affiliate                                                                       |  |      | 259,059    |   |      |   | (1,389,993 | )    |  |   | (299,803    | )
|Accounts receivable, other                                                                           |  |      | 33         |   |      |   | 7,416      |      |  |   | (7,449      | )
|Accounts payable, affiliate                                                                          |  |      | 5,661      |   |      |   | (1,050     | )    |  |   | 328,517     |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Net cash provided by operating activities                                                            |  |      | 6,110,552  |   |      |   | 4,872,553  |      |  |   | 385,883     |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Cash flows from investing activities:                                                                |  |      |            |   |      |   |            |      |  |   |             |  
|Purchase and development of oil and gas properties                                                   |  |      | (534,429   | ) |      |   | (5,628,161 | )    |  |   | (8,525,523  | )
|Prepaid well cost                                                                                    |  |      | 0          |   |      |   | (45,685    | )    |  |   | (4,128,424  | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Net cash used in investing activities                                                                |  |      | (534,429   | ) |      |   | (5,673,846 | )    |  |   | (12,653,947 | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Cash flows from financing activities:                                                                |  |      |            |   |      |   |            |      |  |   |             |  
|Capital contributions from partners                                                                  |  |      | 0          |   |      |   | 0          |      |  |   | 18,000,000  |  
|Cash distributions to partners                                                                       |  |      | (5,578,735 | ) |      |   | (4,746,991 | )    |  |   | (180,000    | )
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Net cash provided by (used in) financing activities                                                  |  |      | (5,578,735 | ) |      |   | (4,746,991 | )    |  |   | 17,820,000  |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Net increase (decrease) in cash and cash equivalents                                                 |  |      | (2,612     | ) |      |   | (5,548,284 | )    |  |   | 5,551,936   |  
|Cash and cash equivalents, beginning of period                                                       |  |      | 3,652      |   |      |   | 5,551,936  |      |  |   | 0           |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Cash and cash equivalents, end of period                                                             |  | $    | 1,040      |   |      | $ | 3,652      |      |  | $ | 5,551,936   |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  
|Supplemental Cash Flow Information:                                                                  |  |      |            |   |      |   |            |      |  |   |             |  
|Non-cash increase to oil & gas properties related to asset retirement obligation liabilities assumed |  | $    | (2,045     | ) |      | $ | 209,842    |      |  | $ | 136,420     |  
|                                                                                                     |  |      |            |   |      |   |            |      |  |   |             |  



The accompanying notes are an
integral part of the financial statements.



21



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##### Table of Contents

Mewbourne Energy Partners 03-A, L.P.

NOTES TO FINANCIAL STATEMENTS

1. Significant Accounting Policies:

Accounting for Oil and Gas Producing Activities

Mewbourne Energy Partners 03-A, L.P., (the Partnership), a Delaware limited partnership engaged primarily in oil and gas development and production in Texas, Oklahoma, and New Mexico, was organized on February 19, 2003. The
offering of limited and general partnership interests began May 16, 2003 as a part of an offering registered under the name Mewbourne Energy Partners 02-03 Drilling Programs, (the Program), and concluded July 9, 2003, with
total investor contributions of $18,000,000 originally being sold to 710 subscribers of which $16,107,005 were sold to 644 subscribers as general partner interests and $1,892,995 were sold to 66 subscribers as limited partner interests. During the
quarter ended March 31, 2005, all general partner interests were converted to limited partner interests.

The Programs sole
business is the development and production of oil and gas with a concentration on gas. Substantially all of the Programs gas reserves are being sold regionally in the spot market. Due to the highly competitive nature of the spot market, prices
are subject to seasonal and regional pricing fluctuations. In addition, such spot market sales are generally short-term in nature and are dependent upon obtaining transportation services provided by pipelines. The prices received for the
Programs oil and gas are subject to influences such as global consumption and supply trends.

The Partnership follows the full-cost
method of accounting for its oil and gas activities. Under the full-cost method, all productive and non-productive costs incurred in the acquisition, exploration and development of oil and gas properties are capitalized. Depreciation, depletion and
amortization of oil and gas properties subject to amortization is computed on the units-of-production method based on the proved reserves underlying the oil and gas properties. At December 31, 2005 and 2004 all capitalized costs were subject to
amortization while at December 31, 2003 approximately $0.5 million of capitalized costs were excluded from amortization. Proceeds from the sale or other disposition of properties are credited to the full cost pool. Gains and losses are not
recognized unless such adjustments would significantly alter the relationship between capitalized costs and the proved oil and gas reserves. Capitalized costs are subject to a quarterly ceiling test that limits such costs to the aggregate of the
present value of future net cash flows of proved reserves and the lower of cost or fair value of unproved properties. There was no cost ceiling write-down for the years ended December 31, 2005 and 2004, while at December 31, 2003 there was
a cost ceiling write-down of $83,646.

Significant estimates inherent in the Registrants financial statements include the estimate of
oil and gas reserves and future abandonment costs as reported in the footnotes to the financial statements. Changes in oil and gas prices and the changes in production estimates could have a significant effect on reserve estimates. The reserve
estimates directly impact the computation of depreciation, depletion, and amortization, asset retirement obligation, and the ceiling test for the Registrants oil and gas properties.

The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions
that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results
could differ from those estimates.



22



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##### Table of Contents

Cash and cash equivalents

The Partnership considers all highly liquid investments, those with original maturities of three months or less at the date of acquisition, to be cash equivalents. The Partnership maintains all its cash in one
financial institution. At various times throughout the year, the cash amount may be in excess of the amount insured by the Federal Deposit Insurance Corporation.

Asset Retirement Obligations

In accordance with FAS 143, the Partnership has recognized an estimated liability for
future plugging and abandonment costs. The estimated liability is based on historical experience and estimated well life. The liability is discounted using the credit-adjusted risk-free rate. Revisions to the liability could occur due to changes in
well plugging and abandonment costs or well useful lives, or if federal or state regulators enact new well restoration requirements. The Partnership recognizes accretion expense in connection with the discounted liability over the remaining life of
the well.

A reconciliation of the Partnerships liability for well plugging and abandonment costs for the years ended
December 31, 2005 and 2004, is as follows:



|                               |  |      |         |   |      |   |        
|------------------------------ |  | ---- | ------- | - | ---- | - | -------
|                               |  | 2005 |         |   | 2004
|Balance, beginning of period   |  | $    | 379,022 |   |      | $ | 145,139
|Sale of oil and gas properties |  |      | (4,950  | ) |      |   | 0      
|Liabilities incurred           |  |      | 2,905   |   |      |   | 209,842
|Accretion expense              |  |      | 16,111  |   |      |   | 24,041 
|                               |  |      |         |   |      |   |        
|Balance, end of period         |  | $    | 393,088 |   |      | $ | 379,022
|                               |  |      |         |   |      |   |        



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Oil and Gas Sales

The Programs oil and condensate production is sold, title passed, and revenue recognized at or near the Programs wells under short-term purchase contracts at prevailing prices in accordance with
arrangements which are customary in the oil industry. Sales of gas applicable to the Programs interest are recorded as revenue when the gas is metered and title transferred pursuant to the gas sales contracts covering the Programs
interest in gas reserves. The Partnership uses the sales method to recognize oil and gas revenue whereby revenue is recognized for the amount of production taken regardless of the amount for which the Partnership is entitled based on its working
interest ownership. As of December 31, 2005, 2004 and 2003, no material gas imbalances between the Partnership and other working interest owners existed.

Income Taxes

The Partnership is treated as a partnership for income tax purposes, and as a result, income of the
Partnership is reported on the tax returns of the partners and no recognition is given to income taxes in the financial statements.

2. Organization and
Related Party Transactions:

The Partnership was organized on February 19, 2003. Mewbourne Development Corporation (MD) is managing
general partner and Mewbourne Oil Company (MOC) is operator of oil and gas properties owned by the Partnership. Mewbourne Holdings, Inc. is the parent of both MD and MOC. Substantially all transactions are with MD and MOC.

In the ordinary course of business, MOC will incur certain costs that will be passed on to well owners of the well on which the costs were incurred. The
partnership will receive their portion of these costs based upon their ownership in each well incurring the costs. These costs are referred to as Operator charges and are standard and customary in the oil and gas industry. Operator charges include
recovery of gas marketing costs, fixed rate overhead, supervision, pumping, and equipment furnished by the Operator. Reimbursement to MOC for operator charges totaled $271,919, $834,580 and $389,778 for the years ended December 31, 2005 and
2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003, respectively. Operator charges are billed in accordance with the program and partnership agreements.

In general, during any particular calendar year, the total amount of administrative expenses allocated to the Partnership by MOC shall not exceed the
greater of (a) 3.5% of the Partnerships gross revenue from the sale of oil and natural gas production during each year (calculated without any deduction for operating costs or other costs and expenses) or (b) the sum of $50,000 plus
..25% of the capital contributions of limited and general partners. Under this arrangement, $244,840, $201,067 and $654 were allocated to the Partnership during the years ended December 31, 2005 and 2004, and for the period from
February 19, 2003 (date of inception) through December 31, 2003, respectively.



24



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##### Table of Contents

The Partnership participates in oil and gas activities through a Drilling Program Agreement, the Program.
The Partnership and MD are parties to the Program agreement. The costs and revenues of the Program are allocated to MD and the Partnership as follows:



|                                                                                                       |  |             |   |  |     |  
|------------------------------------------------------------------------------------------------------ |  | ----------- | - |  | --- | -
|                                                                                                       |  | Partnership |   |  | MD  |  
|Revenues:                                                                                              |  |             |   |  |     |  
|Proceeds from disposition of depreciable and depletable properties                                     |  | 60          | % |  | 40  | %
|All other revenues                                                                                     |  | 60          | % |  | 40  | %
|Costs and expenses:                                                                                    |  |             |   |  |     |  
|Organization and offering costs(1)                                                                     |  | 0           | % |  | 100 | %
|Lease acquisition costs(1)                                                                             |  | 0           | % |  | 100 | %
|Tangible and intangible drilling costs(1)                                                              |  | 100         | % |  | 0   | %
|Operating costs, reporting and legal expenses, general and administrative expenses and all other costs |  | 60          | % |  | 40  | %

---

|(1) | As noted above, pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which will approximate 30% of total capital costs. To
the extent that organization and offering costs and lease acquisition costs are less than 30% of total capital costs, MD is responsible for tangible drilling costs until its share of the Programs total capital costs reaches approximately 30%.
|--- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

The Partnerships financial statements reflect its respective proportionate interest in the Program.

3. Reconciliation of Net income per Statements of Operations with Net income (loss) per Federal Income Tax Return:

The following is a reconciliation of net income per statements of operations with net income (loss) per federal income tax return for the years ended
December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003:



|                                                                                                                          |  |      |           |   |      |   |            |      |  |   |             |  
|------------------------------------------------------------------------------------------------------------------------- |  | ---- | --------- | - | ---- | - | ---------- | ---- |  | - | ----------- | -
|                                                                                                                          |  | 2005 |           |   | 2004 |   |            | 2003 | 
|Net income per statements of operations                                                                                   |  | $    | 3,776,848 |   |      | $ | 3,492,274  |      |  | $ | 99,165      |  
|Intangible development costs capitalized for financial reporting purposes and expensed for tax reporting purposes         |  |      | (344,072  | ) |      |   | (4,820,465 | )    |  |   | (9,394,837  | )
|Dry hole costs capitalized for financial reporting purposes and expensed for tax reporting purposes                       |  |      | (57,157   | ) |      |   | (24,632    | )    |  |   | (1,370,884  | )
|Depreciation, depletion and amortization for financial reporting purposes over (under) amounts for tax reporting purposes |  |      | 1,559,095 |   |      |   | 2,121,829  |      |  |   | (320,781    | )
|Cost ceiling write-down for financial reporting purposes                                                                  |  |      | 0         |   |      |   | 0          |      |  |   | 83,646      |  
|Gain on sale of oil and gas equipment recognized for tax reporting purposes                                               |  |      | 3,698     |   |      |   | 129,525    |      |  |   | 0           |  
|ARO accretion expense for financial reporting purposes                                                                    |  |      | 16,111    |   |      |   | 24,041     |      |  |   | 8,719       |  
|Other                                                                                                                     |  |      | 93,299    |   |      |   | 0          |      |  |   | 0           |  
|                                                                                                                          |  |      |           |   |      |   |            |      |  |   |             |  
|Net income (loss) per federal income tax return before tentative tax depletion                                            |  | $    | 5,047,822 |   |      | $ | 922,572    |      |  | $ | (10,894,972 | )
|                                                                                                                          |  |      |           |   |      |   |            |      |  |   |             |  



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##### Table of Contents

The Partnerships financial reporting bases of its net assets exceeded the tax bases of its net
assets by $12,831,653, $13,979,384 and $11,139,276 at December 31, 2005, 2004 and 2003, respectively.

4. Supplemental Oil and Gas Information
(unaudited):

The tables presented below provide supplemental information about oil and natural gas exploration and production
activities as defined by SFAS No. 69, Disclosures about Oil and Gas Producing Activities.

Costs Incurred and Capitalized Costs:

Costs incurred in oil and natural gas acquisition, exploration and development activities for the years ended December 31,
2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003:



|                             |  |      |         |      |   |           |  |   |          
|---------------------------- |  | ---- | ------- | ---- | - | --------- |  | - | ---------
|                             |  | 2005 |         | 2004 |   | 2003     
|Costs incurred for the year: |  |      |         |      |   |           |  |   |          
|Development                  |  | $    | 580,114 |      | $ | 9,756,584 |  | $ | 8,525,523
|                             |  |      |         |      |   |           |  |   |          

Capitalized costs related to oil and natural gas acquisition, exploration and development
activities for the years ended December 31, 2005 and 2004 are as follows:



|                                                                 |  |      |            |   |      |   |            |  
|---------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                                                 |  | 2005 |            |   | 2004 |  
|Cost of oil and natural gas properties at year-end:              |  |      |            |   |      |   |            |  
|Producing assetsProved properties                               |  | $    | 18,862,221 |   |      | $ | 18,278,947 |  
|Incomplete constructionUnproved properties                      |  |      | 0          |   |      |   | 3,160      |  
|Asset retirement obligation                                      |  |      | 344,218    |   |      |   | 346,263    |  
|                                                                 |  |      |            |   |      |   |            |  
|Total capitalized cost                                           |  |      | 19,206,439 |   |      |   | 18,628,370 |  
|Accumulated depreciation, depletion, amortization and impairment |  |      | (5,049,439 | ) |      |   | (2,996,599 | )
|                                                                 |  |      |            |   |      |   |            |  
|Net capitalized costs                                            |  | $    | 14,157,000 |   |      | $ | 15,631,771 |  
|                                                                 |  |      |            |   |      |   |            |  

Depreciation, depletion and amortization per one thousand cubic feet of gas equivalents was $2.12,
$2.04 and $2.21 for the years ended December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003, respectively.



26



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##### Table of Contents

Estimated Net Quantities of Proved Oil and Gas Reserves:

Reserve estimates as well as certain information regarding future production and discounted cash flows were determined by the Partnerships
independent petroleum consultants and MOCs petroleum reservoir engineers. The Partnership considers reserve estimates to be reasonable, however, due to inherent uncertainties and the limited nature of reservoir data, estimates of oil and gas
reserves are imprecise and subject to change over time as additional information becomes available.

There have been no favorable or
adverse events that have caused a significant change in estimated proved reserves since December 31, 2005. The Partnership has no long-term supply agreements or contracts with governments or authorities in which it acts as producer nor does it
have any interest in oil and gas operations accounted for by the equity method. All reserves are located onshore within the United States.

Proved Reserves:



|                                                 |  |                                      |   |  |                                     |  
|------------------------------------------------ |  | ------------------------------------ | - |  | ----------------------------------- | -
|                                                 |  | Crude Oiland Condensate(bbls of Oil) |   |  | Natural Gas(Thousands ofCubic Feet) |  
|                                                 |  | (In thousands)                       |  
|Balance at February 19, 2003 (date of inception) |  | 0                                    |   |  | 0                                   |  
|Discoveries                                      |  | 52                                   |   |  | 3,344                               |  
|Production                                       |  | (2                                   | ) |  | (70                                 | )
|                                                 |  |                                      |   |  |                                     |  
|Balance at December 31, 2003(1)                  |  | 50                                   |   |  | 3,274                               |  
|Revisions to previous estimates                  |  | 0                                    |   |  | (200                                | )
|Extension, discoveries and other additions       |  | 53                                   |   |  | 5,126                               |  
|Production                                       |  | (19                                  | ) |  | (1,231                              | )
|                                                 |  |                                      |   |  |                                     |  
|Balance at December 31, 2004(1)                  |  | 84                                   |   |  | 6,969                               |  
|Revisions to previous estimates                  |  | 6                                    |   |  | (377                                | )
|Extension, discoveries and other additions       |  | 4                                    |   |  | 186                                 |  
|Production                                       |  | (12                                  | ) |  | (900                                | )
|                                                 |  |                                      |   |  |                                     |  
|Balance at December 31, 2005(1)                  |  | 82                                   |   |  | 5,878                               |  
|                                                 |  |                                      |   |  |                                     |  

---

|(1) | All of these reserves are categorized as proved developed as of December 31, 2005, 2004 and 2003.
|--- | -------------------------------------------------------------------------------------------------

Standardized Measure of Discounted Future Net Cash Flows:

For the years ended
December 31, 2005 and 2004, and for the period from February 19, 2003 (date of inception) through December 31, 2003

The
Standardized measure of discounted future net cash flows from estimated production of proved oil and gas reserves is presented in accordance with the provisions of Statement of Financial Accounting Standards No. 69, Disclosures about Oil
and Gas Producing Activities (SFAS No. 69). In computing this data, assumptions other than those mandated by SFAS No. 69 could produce substantially different results. The Partnership cautions against viewing this information as a
forecast of future economic conditions, revenues, or fair value.



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##### Table of Contents

The standardized measure has been prepared assuming year-end selling prices, year-end development and
production costs and a 10 percent annual discount rate. No future income tax expense has been provided for the Partnership since it incurs no income tax liability. (See Significant Accounting PoliciesIncome Taxes in Note 1 to the Financial
Statements.) The year-end prices were $58.67 per barrel of oil and $7.74 for MCF of gas as of December 31, 2005, $41.84 per barrel of oil and $5.47 for MCF of gas as of December 31, 2004, and $30.60 per barrel of oil and $5.55 for MCF of
gas as of December 31, 2003.



|                        |  |      |             |   |      |   |             |      |  |   |            |  
|----------------------- |  | ---- | ----------- | - | ---- | - | ----------- | ---- |  | - | ---------- | -
|                        |  | 2005 |             |   | 2004 |   |             | 2003 | 
|Future cash inflows     |  | $    | 51,003,867  |   |      | $ | 42,131,781  |      |  | $ | 19,845,840 |  
|Future production cost  |  |      | (15,800,002 | ) |      |   | (12,775,013 | )    |  |   | (4,280,505 | )
|Future development cost |  |      | (278,403    | ) |      |   | (331,796    | )    |  |   | (32,316    | )
|                        |  |      |             |   |      |   |             |      |  |   |            |  
|Future net cash flows   |  |      | 34,925,462  |   |      |   | 29,024,972  |      |  |   | 15,533,019 |  
|Discount at 10 percent  |  |      | (18,882,663 | ) |      |   | (12,736,680 | )    |  |   | (6,909,673 | )
|                        |  |      |             |   |      |   |             |      |  |   |            |  
|Standardized measure    |  | $    | 16,042,799  |   |      | $ | 16,288,292  |      |  | $ | 8,623,346  |  
|                        |  |      |             |   |      |   |             |      |  |   |            |  

Summary of changes in the Standardized Measure



|                                                                |  |      |            |   |      |   |            |      |  |   |           |  
|--------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | ---- |  | - | --------- | -
|                                                                |  | 2005 |            |   | 2004 |   |            | 2003 | 
|Balance, beginning of period                                    |  | $    | 16,288,292 |   |      | $ | 8,623,346  |      |  | $ | 0         |  
|Changes in value of previous years reserves due to:             |  |      |            |   |      |   |            |      |  |   |           |  
|Sale of oil and gas production, net of related cost             |  |      | (6,092,848 | ) |      |   | (6,461,859 | )    |  |   | (320,198  | )
|Extension, discoveries and improved recovery, less related cost |  |      | 561,989    |   |      |   | 13,404,398 |      |  |   | 8,943,544 |  
|Accretion of discount                                           |  |      | 1,628,829  |   |      |   | 862,335    |      |  |   | 0         |  
|Estimated development costs incurred during the year            |  |      | 244,543    |   |      |   | 16,331     |      |  |   | 0         |  
|Change in estimated future development cost                     |  |      | (191,150   | ) |      |   | (315,811   | )    |  |   | 0         |  
|Revisions of previous estimates                                 |  |      | (900,580   | ) |      |   | (1,853,823 | )    |  |   | 0         |  
|Net change in price                                             |  |      | 7,055,093  |   |      |   | 237,854    |      |  |   | 0         |  
|Timing and other                                                |  |      | (2,551,369 | ) |      |   | 1,775,521  |      |  |   | 0         |  
|                                                                |  |      |            |   |      |   |            |      |  |   |           |  
|Balance, end of period                                          |  | $    | 16,042,799 |   |      | $ | 16,288,292 |      |  | $ | 8,623,346 |  
|                                                                |  |      |            |   |      |   |            |      |  |   |           |  



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##### Table of Contents

MEWBOURNE ENERGY PARTNERS 03-A, L.P.

INDEX TO EXHIBITS

The following documents are incorporated by reference in response to Item 15(a)3.



|               |  |                                                                                                                                                                                                    
|-------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|EXHIBIT NUMBER |  | DESCRIPTION                                                                                                                                                                                        
|               | 
|3.1            |  | Form of Certificate of Limited Partnership (filed as Exhibit 3.1 to Registration Statement on Form S-1, File No. 333-85994-01 and incorporated herein by reference)                                
|               | 
|3.2            |  | Form of Certificate of Amendment of the Certificate of Limited Partnership (filed as Exhibit 3.2 to Registration Statement on Form S-1, File No. 333-85994-01 and incorporated herein by
reference)
|               | 
|4.1            |  | Form of Agreement of Partnership (filed as Exhibit 4.1 to Registration Statement on Form S-1, File No. 333-85994-01 and incorporated herein by reference)                                          
|               | 
|10.1           |  | Form of Drilling Program Agreement (filed as Exhibit 10.1 to Registration Statement on Form S-1, File No. 333-85994-01 and incorporated herein by reference)                                       
|               | 
|10.4           |  | Form of Operating Agreement (filed as Exhibit 10.4 to Registration Statement on Form S-1, File No. 333-85994-01 and incorporated herein by reference)                                              
|               | 
|31.1           |  | Certification of CEO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.                                                                                                                        
|               | 
|31.2           |  | Certification of CFO Pursuant to Section 302 of Sarbanes-Oxley Act of 2002.                                                                                                                        
|               | 
|32.1           |  | Certification of CEO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.                                                                                                                        
|               | 
|32.2           |  | Certification of CFO Pursuant to Section 906 of Sarbanes-Oxley Act of 2002.                                                                                                                        



29