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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549



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FORM 10-Q



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

For the quarterly period ended June 30, 2006

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. 333-113340



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MEWBOURNE ENERGY PARTNERS 05-A, L.P.



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|                                                         |  |                                        
|-------------------------------------------------------- |  | ---------------------------------------
|Delaware                                                 |  | 20-2306210                             
|(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)                             

Registrants Telephone Number, including area code: (903) 561-2900

Not Applicable

(Former name, former
address and former fiscal year, if changed since last report)



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Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 of 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 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 if the registrant is a shell company (as defined in Rule 12b-2 of the Exchange
Act).    Yes ̈No  x



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Mewbourne Energy Partners 05-A, L.P.

INDEX



|                               |  |                                                                                                                                                                                                                |  |         
|------------------------------ |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | --------
|                               |  |                                                                                                                                                                                                                |  | Page No.
|Part I  Financial Information |  |                                                                                                                                                                                                               
|                               |  |                                                                                                                                                                                                               
|Item 1.                        |  | Financial Statements                                                                                                                                                                                           |  |         
|                               |  |                                                                                                                                                                                                               
|                               |  | Balance Sheets -June 30, 2006 (Unaudited) and December 31, 2005                                                                                                                                                |  | 3       
|                               |  |                                                                                                                                                                                                               
|                               |  | Statements of Operations (Unaudited) -For the three months ended June 30, 2006 and 2005 and the six months ended June 30, 2006 and the period from February 14, 2005 (date of inception) through June 30, 2005 |  | 4       
|                               |  |                                                                                                                                                                                                               
|                               |  | Statements of Cash Flows (Unaudited) -For the six months ended June 30, 2006 and the period from February 14, 2005 (date of inception) through June 30, 2005                                                   |  | 5       
|                               |  |                                                                                                                                                                                                               
|                               |  | Statement of Changes In Partners Capital (Unaudited) -For the six months ended June 30, 2006                                                                                                                  |  | 6       
|                               |  |                                                                                                                                                                                                               
|                               |  | Notes to Financial Statements                                                                                                                                                                                  |  | 7       
|                               |  |                                                                                                                                                                                                               
|Item 2.                        |  | Managements Discussion and Analysis of Financial Condition and Results of Operations                                                                                                                          |  | 10      
|                               |  |                                                                                                                                                                                                               
|Item 3.                        |  | Quantitative and Qualitative Disclosures about Market Risk                                                                                                                                                     |  | 12      
|                               |  |                                                                                                                                                                                                               
|Item 4.                        |  | Disclosure Controls and Procedures                                                                                                                                                                             |  | 12      
|                               | 
|Part II  Other Information    |  |                                                                                                                                                                                                               
|                               |  |                                                                                                                                                                                                               
|Item 1.                        |  | Legal Proceedings                                                                                                                                                                                              |  | 12      
|                               |  |                                                                                                                                                                                                               
|Item 6.                        |  | Exhibits and Reports on Form 8-K                                                                                                                                                                               |  | 13      



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Mewbourne Energy Partners 05-A, L.P.

Part I  Financial Information

Item 1. Financial Statements

BALANCE SHEETS

June 30, 2006 and December 31, 2005



|                                                                      |  |               |            |   |                  |   |            |  
|--------------------------------------------------------------------- |  | ------------- | ---------- | - | ---------------- | - | ---------- | -
|                                                                      |  | June 30, 2006 |            |   | December 31,2005 |  
|                                                                      |  | (Unaudited)   |            |   |                  |  
|ASSETS                                                                |  |               |            |   |                  |   |            |  
|Cash and cash equivalents                                             |  | $             | 7,026,739  |   |                  | $ | 12,773,922 |  
|Accounts receivable, affiliate                                        |  |               | 1,070,352  |   |                  |   | 658,685    |  
|Accounts receivable, other                                            |  |               | 28,474     |   |                  |   | 71,534     |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total current assets                                                  |  |               | 8,125,565  |   |                  |   | 13,504,141 |  
|                                                                      |  |               |            |   |                  |   |            |  
|Prepaid well costs                                                    |  |               |           |   |                  |   | 6,916,712  |  
|                                                                      |  |               |            |   |                  |   |            |  
|Oil and gas properties at cost, full cost method                      |  |               | 27,095,918 |   |                  |   | 8,738,508  |  
|Less accumulated depreciation, depletion, amortization and impairment |  |               | (6,631,093 | ) |                  |   | (235,148   | )
|                                                                      |  |               |            |   |                  |   |            |  
|                                                                      |  |               | 20,464,825 |   |                  |   | 8,503,360  |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total assets                                                          |  | $             | 28,590,390 |   |                  | $ | 28,924,213 |  
|                                                                      |  |               |            |   |                  |   |            |  
|LIABILITIES AND PARTNERS CAPITAL                                     |  |               |            |   |                  |   |            |  
|Accounts payable, affiliate                                           |  | $             | 6,452,659  |   |                  | $ | 646,910    |  
|                                                                      |  |               |            |   |                  |   |            |  
|Asset retirement obligation plugging liability                        |  |               | 76,460     |   |                  |   | 26,373     |  
|                                                                      |  |               |            |   |                  |   |            |  
|Partners capital                                                     |  |               |            |   |                  |   |            |  
|General partners                                                      |  |               | 19,742,489 |   |                  |   | 25,278,932 |  
|Limited partners                                                      |  |               | 2,318,782  |   |                  |   | 2,971,998  |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total partners capital                                               |  |               | 22,061,271 |   |                  |   | 28,250,930 |  
|                                                                      |  |               |            |   |                  |   |            |  
|Total liabilities and partners capital                               |  | $             | 28,590,390 |   |                  | $ | 28,924,213 |  
|                                                                      |  |               |            |   |                  |   |            |  

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



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Mewbourne Energy Partners 05-A, L.P.

STATEMENTS OF OPERATIONS

For the three months ended June 30, 2006 and 2005,

the six months ended June 30, 2006 and the period from

February 14, 2005 (date of inception) through June 30, 2005

(Unaudited)



|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|---------------------------------------------------------------------------------------------------- |  | -------------------------- | ---------- | ------------------------ | ---- | - | ---- |  | - | ---------- | - |  | - | -
|                                                                                                     |  | Three Months EndedJune 30, |            | Six Months EndedJune 30,
|                                                                                                     |  | 2006                       |            |                          | 2005 |   | 2006 |  |   | 2005      
|Revenues and other income:                                                                           |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|                                                                                                     |  |                            |            |                         
|Oil and gas sales                                                                                    |  | $                          | 1,583,156  |                          |      | $ |     |  | $ | 2,964,517  |   |  | $ | 
|Interest income                                                                                      |  |                            | 110,256    |                          |      |   |     |  |   | 239,519    |   |  |   | 
|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|Total revenues and other income                                                                      |  |                            | 1,693,412  |                          |      |   |     |  |   | 3,204,036  |   |  |   | 
|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|Expenses:                                                                                            |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|                                                                                                     |  |                            |            |                         
|Lease operating expense                                                                              |  |                            | 68,111     |                          |      |   |     |  |   | 117,752    |   |  |   | 
|Production taxes                                                                                     |  |                            | 118,540    |                          |      |   |     |  |   | 226,055    |   |  |   | 
|Administrative and general expense                                                                   |  |                            | 61,002     |                          |      |   |     |  |   | 96,840     |   |  |   | 
|Depreciation, depletion, and amortization                                                            |  |                            | 720,798    |                          |      |   |     |  |   | 1,277,602  |   |  |   | 
|Cost ceiling write-down                                                                              |  |                            | 3,259,177  |                          |      |   |     |  |   | 5,118,343  |   |  |   | 
|Asset retirement obligation accretion                                                                |  |                            | 1,557      |                          |      |   |     |  |   | 2,103      |   |  |   | 
|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|Net (loss)                                                                                           |  | $                          | (2,535,773 | )                        |      | $ |     |  | $ | (3,634,659 | ) |  | $ | 
|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|Allocation of net (loss):                                                                            |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|General partners                                                                                     |  | $                          | (2,268,164 | )                        |      | $ |     |  | $ | (3,251,081 | ) |  | $ | 
|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|Limited partners                                                                                     |  | $                          | (267,609   | )                        |      | $ |     |  | $ | (383,578   | ) |  | $ | 
|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  
|Basic and diluted net (loss) per limited and general partner interest (30,000 interests outstanding) |  | $                          | (84.53     | )                        |      | $ |     |  | $ | (121.16    | ) |  | $ | 
|                                                                                                     |  |                            |            |                          |      |   |      |  |   |            |   |  |   |  

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



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Mewbourne Energy Partners 05-A, L.P.

STATEMENTS OF CASH FLOWS

For the six months ended June 30, 2006 and

the period from February 14, 2005 (date of inception)

through June 30, 2005

(Unaudited)



|                                                                               |  |      |            |   |      |   |  
|------------------------------------------------------------------------------ |  | ---- | ---------- | - | ---- | - | -
|                                                                               |  | 2006 |            |   | 2005
|Cash flows from operating activities:                                          |  |      |            |   |      |   |  
|Net loss                                                                       |  | $    | (3,634,659 | ) |      | $ | 
|Adjustment to reconcile net loss to net cash provided by operating activities: |  |      |            |   |      |   |  
|Depreciation, depletion, and amortization                                      |  |      | 1,277,602  |   |      |   | 
|Cost ceiling write-down                                                        |  |      | 5,118,343  |   |      |   | 
|Asset retirement obligation accretion                                          |  |      | 2,103      |   |      |   | 
|Changes in operating assets and liabilities:                                   |  |      |            |   |      |   |  
|Accounts receivable, affiliate                                                 |  |      | (411,667   | ) |      |   | 
|Accounts receivable, other                                                     |  |      | 43,060     |   |      |   | 
|Accounts payable, affiliate                                                    |  |      | 3,685,605  |   |      |   | 
|                                                                               |  |      |            |   |      |   |  
|Net cash provided by operating activities                                      |  |      | 6,080,387  |   |      |   | 
|                                                                               |  |      |            |   |      |   |  
|Cash flows from investing activities:                                          |  |      |            |   |      |   |  
|Purchase and development of oil and gas properties                             |  |      | (9,272,570 | ) |      |   | 
|                                                                               |  |      |            |   |      |   |  
|Net cash used in investing activities                                          |  |      | (9,272,570 | ) |      |   | 
|                                                                               |  |      |            |   |      |   |  
|Cash flows from financing activities:                                          |  |      |            |   |      |   |  
|Cash distributions to partners                                                 |  |      | (2,555,000 | ) |      |   | 
|                                                                               |  |      |            |   |      |   |  
|Net cash used in financing activities                                          |  |      | (2,555,000 | ) |      |   | 
|                                                                               |  |      |            |   |      |   |  
|Net decrease in cash and cash equivalents                                      |  |      | (5,747,183 | ) |      |   | 
|Cash and cash equivalents, beginning of period                                 |  |      | 12,773,922 |   |      |   | 
|                                                                               |  |      |            |   |      |   |  
|Cash and cash equivalents, end of period                                       |  | $    | 7,026,739  |   |      | $ | 
|                                                                               |  |      |            |   |      |   |  

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



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Mewbourne Energy Partners 05-A, L.P.

STATEMENT OF CHANGES IN PARTNERS CAPITAL

For the six months ended June 30, 2006

(Unaudited)



|                             |  |                 |            |   |                 |   |           |       |  |   |            |  
|---------------------------- |  | --------------- | ---------- | - | --------------- | - | --------- | ----- |  | - | ---------- | -
|                             |  | GeneralPartners |            |   | LimitedPartners |   |           | Total | 
|Balance at December 31, 2005 |  | $               | 25,278,932 |   |                 | $ | 2,971,998 |       |  | $ | 28,250,930 |  
|Cash distributions           |  |                 | (2,285,362 | ) |                 |   | (269,638  | )     |  |   | (2,555,000 | )
|Net loss                     |  |                 | (3,251,081 | ) |                 |   | (383,578  | )     |  |   | (3,634,659 | )
|                             |  |                 |            |   |                 |   |           |       |  |   |            |  
|Balance at June 30, 2006     |  | $               | 19,742,489 |   |                 | $ | 2,318,782 |       |  | $ | 22,061,271 |  
|                             |  |                 |            |   |                 |   |           |       |  |   |            |  

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



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Mewbourne Energy Partners 05-A, L.P.

NOTES TO FINANCIAL STATEMENTS

(Unaudited)

1. Accounting
Policies

Reference is hereby made to the Registrants Annual Report on Form 10-K for 2005, which contains a summary of significant accounting policies
followed by the Partnership in the preparation of its financial statements. These policies are also followed in preparing the quarterly report included herein.

In the opinion of management, the accompanying unaudited financial statements contain all adjustments of a normal recurring nature necessary to present fairly our financial position, results of operations, cash flows and partners
capital for the periods presented. The results of operations for the interim periods are not necessarily indicative of the final results expected for the full year.

2. Accounting for Oil and Gas Producing Activities

Mewbourne Energy Partners 05-A, L.P., (the Registrant or the Partnership), a Delaware limited partnership is engaged primarily in oil and gas development and production in Texas, Oklahoma, and New Mexico, and was
organized on February 14, 2005. The offering of limited and general partnership interests began June 1, 2005 as a part of an offering registered under the name Mewbourne Energy Partners 04-05 Drilling Programs and concluded July 29,
2005, with total investor contributions of $30,000,000 originally being sold to 1,128 subscribers of which $26,844,000 were sold to 998 subscribers as general partner interests and $3,156,000 were sold to 130 subscribers as limited partner
interests. Since the Partnership was not funded until July 29, 2005, no business was conducted by the Partnership during the period from February 14, 2005 (date of inception) to June 30, 2005, therefore, there are no items of income
or expense for that reporting period.

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 June 30, 2006, approximately $2.6 million of capitalized costs were excluded from amortization, while at December 31, 2005,
approximately $1.6 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 on the sale or other disposition of properties 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 a cost ceiling write-down of $5,118,343 for the six month period ended June 30, 2006. The cost ceiling write-down
was caused by the lower gas prices at June 30, 2006.



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3. Asset Retirement Obligations

In accordance with Financial Accounting Standards Board Statement No. 143, Accounting for Asset Retirement Obligations, 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 six months ended
June 30, 2006, is as follows:



|                             |  |   |       
|---------------------------- |  | - | ------
|Balance, beginning of period |  | $ | 26,373
|Liabilities incurred         |  |   | 47,984
|Accretion expense            |  |   | 2,103 
|                             |  |   |       
|Balance, end of period       |  | $ | 76,460
|                             |  |   |       

4. Related Party Transactions

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.
Services and operator charges are billed in accordance with the program and partnership agreements.

In consideration for services rendered by MD in
managing the business of the Partnership, the Partnership during each of the initial three years of the Partnership will pay to MD a management fee in the amount equal to 7/10s of 1% of the subscriptions by the investor partners to the
Partnership. Effective 01/01/2006 the Partnership has elected to include the management fee as part of the full cost pool pursuant to Rule 4-10(c)(6)(iii) and (iv) of Regulation S-X.

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.

5. Supplemental Cash Flow Information

During the six months ended June 30, 2006, the Partnership recorded non-cash increases to our oil and gas properties related to the incurrence of additional accounts
payable to MOC totaling $2,120,143.



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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                                     |  | 70          | % |  | 30  | %
|All other revenues                                                                                     |  | 70          | % |  | 30  | %
|Costs and expenses:                                                                                    |  |             |   |  |     |  
|Sales commissions and due diligence fees (1)                                                           |  | 100         | % |  | 0   | %
|Organization and offering costs (2)                                                                    |  | 0           | % |  | 100 | %
|Lease acquisition costs (2)                                                                            |  | 0           | % |  | 100 | %
|Tangible and intangible drilling costs (2)                                                             |  | 100         | % |  | 0   | %
|Operating costs, reporting and legal expenses, general and administrative expenses and all other costs |  | 70          | % |  | 30  | %

---

|(1) | The Partnership will pay sales commissions and due diligence fees of 8% and 0.5%, respectively, of the capital contributions initially made by investor partners in exchange for
their respective interests.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(2) | As noted above, pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which approximate 20% of total capital costs. To the
extent that organization and offering costs and lease acquisition costs are less than 20% of total capital costs, MD is responsible for tangible drilling costs until its share of the Programs total capital costs reaches approximately 20%.
|--- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

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



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Item 2. Managements Discussion and Analysis of Financial Condition and Results of Operations

Liquidity and Capital Resources

Mewbourne Energy Partners 05-A, L.P. was formed February 14, 2005. The offering of limited and general
partnership interests began June 1, 2005 and concluded July 29, 2005, with total investor contributions of $30,000,000.

The Partnership has
acquired interests in oil and gas prospects for the purpose of development drilling. The Partnership has participated in the drilling of 69 wells. 66 wells were drilled and were productive and 3 wells were drilled and abandoned.

Future capital requirements and operations will be conducted with available funds generated from oil and gas activities. No bank borrowing is anticipated. The
Partnership had net working capital of $1,672,906 at June 30, 2006.

During the six months ended June 30, 2006, the Partnership made cash
distributions to the investor partners in the amount of $2,555,000. The Partnership expects that cash distributions will continue during 2006 as additional oil and gas revenues are sufficient to produce cash flows from operations.

The sale of crude oil and natural gas produced by the Partnership will be affected by a number of factors that are beyond the Partnership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 Partnership.



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Results of Operations

Revenues and other income for the three months period ended June 30, 2006 totaled $1,693,412, and consisted of oil and gas sales of $1,583,156 and interest income of
$110,256. Production volumes during the period ended June 30, 2006 were approximately 2,634 bbls of oil and 248,165 mcf of gas at corresponding average realized prices of $66.66 per bbl of oil and $5.67 per mcf of gas. Expenses totaling
$4,229,185, consisting primarily of lease operating expenses in the amount of $68,111, production taxes in the amount of $118,540, depreciation, depletion, and amortization in the amount of $720,798, and a cost ceiling write-down in the amount of
$3,259,177 resulted in net loss for the three month period ended June 30, 2006 of $2,535,773.

Revenues and other income for the six months period
ended June 30, 2006 totaled $3,204,036, and consisted of oil and gas sales of $2,964,517 and interest income of $239,519. Production volumes during the period ended June 30, 2006 were approximately 3,609 bbls of oil and 442,135 mcf of gas
at corresponding average realized prices of $64.98 per bbl of oil and $6.17 per mcf of gas. Expenses totaling $6,838,695, consisting primarily of lease operating expenses in the amount of $117,752, production taxes in the amount of $226,055,
depreciation, depletion, and amortization in the amount of $1,277,602, and a cost ceiling write-down in the amount of $5,118,343 resulted in net loss for the six month period ended June 30, 2006 of $3,634,659. The cost ceiling write-down was
caused by the lower gas price at June 30, 2006. The Partnerships oil and gas production should increase during the remainder of 2006 as additional wells are completed and oil and gas production is sold. Interest income should decrease in
2006 as available cash is utilized for drilling and equipping of wells. The Partnership expects that drilling and completion costs will decrease during 2006 and that production costs, operating expenses and depletion provisions will increase.

The Partnerships operations did not commence until the third quarter of 2005. No corresponding activities, therefore, occurred during the period
from February 14, 2005 (date of inception) through June 30, 2005.



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Item 3. Quantitative and Qualitative Disclosures about Market Risk

1. Interest Rate Risk

The Partnership Agreement allows borrowings from banks or other financial sources of up to 20% of the total capital contributions to the Partnership
without investor approval. Should the Partnership elect to borrow monies for additional development activity on Partnership properties, it will be subject to the interest rate risk inherent in borrowing activities. Changes in interest rates could
significantly affect the Partnerships results of operations and the amount of net cash flow available for partner distributions. Also, to the extent that changes in interest rates affect general economic conditions, the Partnership will be
affected by such changes.

2. Commodity Price Risk

The Partnership does not expect to engage in commodity futures trading or hedging activities or enter into derivative financial instrument transactions for trading or other speculative purposes. The Partnership
expects to sell a vast majority of its production from successful oil and gas wells on a month-to-month basis at current spot market prices. Accordingly, the Partnership is at risk for the volatility in commodity prices inherent in the oil and gas
industry, and the level of commodity prices will have a significant impact on the Partnerships results of operations.

3. Exchange Rate Risk

The Partnership currently has no income from foreign sources or operations in foreign countries that would subject it to
currency exchange rate risk. The Partnership does not currently expect to purchase any prospects located outside of either the United States or United States coastal waters in the Gulf of Mexico.

Item 4. Disclosure 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. MDs Chief Executive Officer and Chief Financial Officer have
evaluated the effectiveness of the design and operation of its 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 its disclosure controls and procedures are effective as of June 30, 2006 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 were no changes in MDs internal controls over financial reporting that occurred during the most recent fiscal quarter that materially affected, or
are reasonably likely to materially affect, its internal controls over financial reporting.

Part II  Other Information

Item 1. Legal Proceedings

None.



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Item 6. Exhibits and Reports on Form 8-K



| | (a) | Exhibits filed herewith.
| | --- | ------------------------



|     |  |                                                                            
|---- |  | ---------------------------------------------------------------------------
|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.



| | (b) | Reports on Form 8-K
| | --- | -------------------

None.



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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Partnership has duly caused this report to be signed on its behalf by the undersigned thereto duly authorized.



|                      |  |                                      |  |                                  
|--------------------- |  | ------------------------------------ |  | ---------------------------------
|                      |  | Mewbourne Energy Partners 05-A, L.P.
|                      |  |                                     
|                      |  | By:                                  |  | Mewbourne Development Corporation
|                      |  |                                      |  | Managing General Partner         
|Date: August 21, 2006 |  |                                      |  |                                  
|                      |  | By:                                  |  | /s/ Alan Clark                   
|                      |  |                                      |  | Alan Clark, Treasurer            



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INDEX TO EXHIBITS



|              |  |                                                                            
|------------- |  | ---------------------------------------------------------------------------
|EXHIBITNUMBER |  | DESCRIPTION                                                                
|              | 
|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.



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