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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, 2007

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                                                                                                                               |  |         
|                                     |  |                                                                                                                                                   
|                                     |  | Condensed Balance Sheets  June 30, 2007 (Unaudited) and December 31, 2006                                                                         |  | 3       
|                                     |  |                                                                                                                                                   
|                                     |  | Condensed Statements of Operations (Unaudited)  For the three months ended June 30, 2007 and 2006 and the six months ended June 30, 2007 and 2006 |  | 4       
|                                     |  |                                                                                                                                                   
|                                     |  | Condensed Statements of Cash Flows (Unaudited)  For the six months ended June 30, 2007 and 2006                                                   |  | 5       
|                                     |  |                                                                                                                                                   
|                                     |  | Condensed Statement of Changes In Partners Capital (Unaudited)  For the six months ended June 30, 2007                                           |  | 6       
|                                     |  |                                                                                                                                                   
|                                     |  | Notes to Condensed 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                                                                                         |  | 13      
|                                     |  |                                                                                                                                                   
|Item 4.                              |  | Disclosure Controls and Procedures                                                                                                                 |  | 13      
|                                     | 
|Part II        Other Information    |  |                                                                                                                                                   
|                                     |  |                                                                                                                                                   
|Item 1.                              |  | Legal Proceedings                                                                                                                                  |  | 14      
|                                     |  |                                                                                                                                                   
|Item 6.                              |  | Exhibits and Reports on Form 8-K                                                                                                                   |  | 14      



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##### Table of Contents

Mewbourne Energy Partners 05-A, L.P.

Part I  Financial Information



|Item 1. | Financial Statements
|------- | --------------------

CONDENSED BALANCE SHEETS

June 30, 2007 and December 31, 2006



|                                                                      |  |               |             |   |                  |   |             |  
|--------------------------------------------------------------------- |  | ------------- | ----------- | - | ---------------- | - | ----------- | -
|                                                                      |  | June 30, 2007 |             |   | December 31,2006 |  
|                                                                      |  | (Unaudited)   |             |   |                  |  
|ASSETS                                                                |  |               |             |   |                  |   |             |  
|Cash                                                                  |  | $             | 534         |   |                  |   | 3,045       |  
|Accounts receivable, affiliate                                        |  |               | 1,512,346   |   |                  |   | 1,551,686   |  
|                                                                      |  |               |             |   |                  |   |             |  
|Total current assets                                                  |  |               | 1,512,880   |   |                  |   | 1,554,731   |  
|                                                                      |  |               |             |   |                  |   |             |  
|Oil and gas properties at cost, full cost method                      |  |               | 29,290,621  |   |                  |   | 28,739,898  |  
|Less accumulated depreciation, depletion, amortization and impairment |  |               | (15,394,696 | ) |                  |   | (14,310,471 | )
|                                                                      |  |               |             |   |                  |   |             |  
|                                                                      |  |               | 13,895,925  |   |                  |   | 14,429,427  |  
|                                                                      |  |               |             |   |                  |   |             |  
|Total assets                                                          |  | $             | 15,408,805  |   |                  | $ | 15,984,158  |  
|                                                                      |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|LIABILITIES AND PARTNERS CAPITAL                                     |  |               |             |   |                  |   |             |  
|                                                                      |  |              
|Accounts payable, affiliate                                           |  | $             | 1,863,419   |   |                  | $ | 1,273,400   |  
|                                                                      |  |              
|Asset retirement obligation                                           |  |               | 106,406     |   |                  |   | 102,573     |  
|                                                                      |  |              
|Partners capital                                                     |  |               |             |   |                  |   |             |  
|General partners                                                      |  |               |            |   |                  |   | 13,075,951  |  
|Limited partners                                                      |  |               | 13,438,980  |   |                  |   | 1,532,234   |  
|                                                                      |  |               |             |   |                  |   |             |  
|Total partners capital                                               |  |               | 13,438,980  |   |                  |   | 14,608,185  |  
|                                                                      |  |               |             |   |                  |   |             |  
|Total liabilities and partners capital                               |  | $             | 15,408,805  |   |                  | $ | 15,984,158  |  
|                                                                      |  |               |             |   |                  |   |             |  

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



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Mewbourne Energy Partners 05-A, L.P.

CONDENSED STATEMENTS OF OPERATIONS

For the three months ended June 30, 2007 and 2006 and

the six months ended June 30, 2007 and 2006

(Unaudited)



|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|----------------------------------------------------------------------------------------------------------- |  | --------------------------- | --------- | ---- | ------------------------- | ---------- | ---- |  | ---- | --------- |  | - | ---------- | -
|                                                                                                            |  | Three Months Ended June 30, |           |      | Six Months Ended June 30, |           
|                                                                                                            |  | 2007                        |           | 2006 |                           |            | 2007 |  | 2006 |          
|Revenues and other income:                                                                                  |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Oil and gas sales                                                                                           |  | $                           | 2,226,895 |      | $                         | 1,583,156  |      |  | $    | 4,332,509 |  | $ | 2,964,517  |  
|Interest income                                                                                             |  |                             | 1,260     |      |                           | 110,256    |      |  |      | 2,843     |  |   | 239,519    |  
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Total revenues and other income                                                                             |  |                             | 2,228,155 |      |                           | 1,693,412  |      |  |      | 4,335,352 |  |   | 3,204,036  |  
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Expenses:                                                                                                   |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Lease operating expense                                                                                     |  |                             | 144,508   |      |                           | 68,111     |      |  |      | 286,121   |  |   | 117,752    |  
|Production taxes                                                                                            |  |                             | 169,209   |      |                           | 118,540    |      |  |      | 333,502   |  |   | 226,055    |  
|Administrative and general expense                                                                          |  |                             | 104,649   |      |                           | 61,002     |      |  |      | 201,876   |  |   | 96,840     |  
|Depreciation, depletion, and amortization                                                                   |  |                             | 539,749   |      |                           | 720,798    |      |  |      | 1,084,225 |  |   | 1,277,602  |  
|Cost ceiling write-down                                                                                     |  |                             |          |      |                           | 3,259,177  |      |  |      |          |  |   | 5,118,343  |  
|Asset retirement obligation accretion                                                                       |  |                             | 1,916     |      |                           | 1,557      |      |  |      | 3,833     |  |   | 2,103      |  
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Net income (loss)                                                                                           |  | $                           | 1,268,124 |      | $                         | (2,535,773 | )    |  | $    | 2,425,795 |  | $ | (3,634,659 | )
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Allocation of net income (loss):                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|General partners                                                                                            |  | $                           |          |      | $                         | (2,268,164 | )    |  | $    |          |  | $ | (3,251,081 | )
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Limited partners                                                                                            |  | $                           | 1,268,124 |      | $                         | (267,609   | )    |  | $    | 2,425,795 |  | $ | (383,578   | )
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  
|Basic and diluted net income (loss) per limited and general partner interest (30,000 interests outstanding) |  | $                           | 42.27     |      | $                         | (84.53     | )    |  | $    | 80.86     |  | $ | (121.16    | )
|                                                                                                            |  |                             |           |      |                           |            |      |  |      |           |  |   |            |  

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



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Mewbourne Energy Partners 05-A, L.P.

CONDENSED STATEMENTS OF CASH FLOWS

For the six months ended June 30, 2007 and 2006

(Unaudited)



|                                                                                         |  |      |            |   |      |   |            |  
|---------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ---------- | -
|                                                                                         |  | 2007 |            |   | 2006 |  
|Cash flows from operating activities:                                                    |  |      |            |   |      |   |            |  
|Net income (loss)                                                                        |  | $    | 2,425,795  |   |      | $ | (3,634,659 | )
|Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |      |            |   |      |   |            |  
|Depreciation, depletion, and amortization                                                |  |      | 1,084,225  |   |      |   | 1,277,602  |  
|Cost ceiling write-down                                                                  |  |      |           |   |      |   | 5,118,343  |  
|Asset retirement obligation accretion                                                    |  |      | 3,833      |   |      |   | 2,103      |  
|Changes in operating assets and liabilities:                                             |  |      |            |   |      |   |            |  
|Accounts receivable, affiliate                                                           |  |      | 39,340     |   |      |   | (411,667   | )
|Accounts receivable, other                                                               |  |      |           |   |      |   | 43,060     |  
|Accounts payable, affiliate                                                              |  |      | 590,019    |   |      |   | 3,685,605  |  
|                                                                                         |  |      |            |   |      |   |            |  
|Net cash provided by operating activities                                                |  |      | 4,143,212  |   |      |   | 6,080,387  |  
|                                                                                         |  |      |            |   |      |   |            |  
|Cash flows from investing activities:                                                    |  |      |            |   |      |   |            |  
|Purchase and development of oil and gas properties                                       |  |      | (550,723   | ) |      |   | (9,272,570 | )
|                                                                                         |  |      |            |   |      |   |            |  
|Net cash used in investing activities                                                    |  |      | (550,723   | ) |      |   | (9,272,570 | )
|                                                                                         |  |      |            |   |      |   |            |  
|Cash flows from financing activities:                                                    |  |      |            |   |      |   |            |  
|Cash distributions to partners                                                           |  |      | (3,595,000 | ) |      |   | (2,555,000 | )
|                                                                                         |  |      |            |   |      |   |            |  
|Net cash used in financing activities                                                    |  |      | (3,595,000 | ) |      |   | (2,555,000 | )
|                                                                                         |  |      |            |   |      |   |            |  
|Net decrease in cash and cash equivalents                                                |  |      | (2,511     | ) |      |   | (5,747,183 | )
|                                                                                         |  |     
|Cash and cash equivalents, beginning of period                                           |  |      | 3,045      |   |      |   | 12,773,922 |  
|                                                                                         |  |      |            |   |      |   |            |  
|Cash and cash equivalents, end of period                                                 |  | $    | 534        |   |      | $ | 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.

CONDENSED STATEMENT OF CHANGES IN PARTNERS CAPITAL

For the six months ended June 30, 2007

(Unaudited)



|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|-------------------------------------------------------------------- |  | --------------- | ----------- | - | --------------- | - | ---------- | ----- |  | - | ---------- | -
|                                                                     |  | GeneralPartners |             |   | LimitedPartners |   |            | Total | 
|Balance at December 31, 2006                                         |  | $               | 13,075,951  |   |                 | $ | 1,532,234  |       |  | $ | 14,608,185 |  
|Conversion of general partner interests to limited partner interests |  |                 | (13,075,951 | ) |                 |   | 13,075,951 |       |  |   |           |  
|Cash distributions                                                   |  |                 |            |   |                 |   | (3,595,000 | )     |  |   | (3,595,000 | )
|Net income                                                           |  |                 |            |   |                 |   | 2,425,795  |       |  |   | 2,425,795  |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at June 30, 2007                                             |  | $               |            |   |                 | $ | 13,438,980 |       |  | $ | 13,438,980 |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  

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



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Mewbourne Energy Partners 05-A, L.P.

NOTES TO CONDENSED FINANCIAL STATEMENTS

(Unaudited)



|1. | Accounting Policies
|-- | -------------------

Reference is hereby made to the Registrants
Annual Report on Form 10-K for 2006, 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 Program, (the Program), 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. During
the quarter ended March 31, 2007, all general partner interests were converted to limited partner interests and accordingly all partnership interests have been reflected in the accompanying financial statements as limited partner interests. In
accordance with the laws of the State of Delaware, Mewbourne Development Corporation (MD), a Delaware Corporation, has been appointed as the Partnerships managing general partner. MD has no equity interest in the Partnership.

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, 2007, all capitalized costs were subject to amortization while at June 30, 2006, approximately $2.6 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 no cost ceiling write-down for the six month period ended June 30, 2007. There was a cost ceiling write-down of $5,118,343 for the six month period ended June 30, 2006.



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|3. | 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, 2007 and the year ended December 31, 2006 is as follows:



|                             |  |              |         |                  |   |        
|---------------------------- |  | ------------ | ------- | ---------------- | - | -------
|                             |  | June 30,2007 |         | December 31,2006
|Balance, beginning of period |  | $            | 102,573 |                  | $ | 26,373 
|Liabilities incurred         |  |              |        |                  |   | 70,864 
|Accretion expense            |  |              | 3,833   |                  |   | 5,336  
|                             |  |              |         |                  |   |        
|Balance, end of period       |  | $            | 106,406 |                  | $ | 102,573
|                             |  |              |         |                  |   |        



|4. | Related Party Transactions
|-- | --------------------------

In accordance with the laws of the State of
Delaware, Mewbourne Development Corporation (MD), a Delaware Corporation, has been appointed as the Partnerships managing general partner. MD has no equity interest in the Partnership. 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 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% of the subscriptions by the
investor partners to the partnership. Effective January 1, 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.



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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:                                                                                    |  |             |   |  |     |  
|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 |  | 70          | % |  | 30  | %

---

|(1) | 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. During the quarter ended March 31, 2007, all general partner interests were converted to
limited partner interests and accordingly all partnership interests have been reflected in the accompanying financial statements as limited partner interests.

The Partnership has acquired interests in oil and gas prospects for the purpose of development drilling. The Partnership participated in the drilling of eighty-six wells. Eighty-three wells were drilled and were productive and three 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 $(350,539) at June 30, 2007.

During the six months ended June 30,
2007, the Partnership made cash distributions to the investor partners in the amount of $3,595,000 as compared to $2,555,000 for the six months ended June 30, 2006. The Partnership expects that cash distributions will continue during 2007 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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##### Table of Contents

Results of Operations

Three months ended June 30, 2007 as compared to the three months ended June 30, 2006.

Oil and gas revenues



|                  |  |                             |           |      |   |          
|----------------- |  | --------------------------- | --------- | ---- | - | ---------
|                  |  | Three Months Ended June 30,
|                  |  | 2007                        |           | 2006
|Oil and gas sales |  | $                           | 2,226,895 |      | $ | 1,583,156
|Barrels produced  |  |                             | 6,635     |      |   | 2,634    
|Mcf produced      |  |                             | 258,235   |      |   | 248,165  
|Average price/bbl |  | $                           | 60.63     |      | $ | 66.66    
|Average price/mcf |  | $                           | 7.07      |      | $ | 5.67     

As shown in the table above, total oil and gas sales increased $643,739 (40.7%) for the three months ended
June 30, 2007 as compared to the three months ended June 30, 2006. Of this increase, $242,536 and $70,104, respectively, were related to increases in volumes of oil and gas sold. Volumes of oil and gas sold increased by 4,001 bbls of oil
and 10,070 mcf of gas for the three months ended June 30, 2007 as compared to the three months ended June 30, 2006. The increase in volumes of oil and gas sold was primarily due to the addition of seventeen new wells completed since
June 30, 2006. Also, an increase in the average price of gas resulted in an additional increase in gas sales of $346,977 These increases were partially offset by a decrease of $15,878 in oil sales for the three months ended June 30, 2007
due to a decrease in the average price of oil sold. The average oil price decreased to $60.63 per bbl for the three months ended June 30, 2007 from $66.66 per bbl for the three months ended June 30, 2006. The average gas price increased to
$7.07 per mcf for the three months ended June 30, 2007 from $5.67 for the three months ended June 30, 2006.

Interest income. Interest income was
$1,260 during the three months ended June 30, 2007 as compared to $110,256 during the three month period ended June 30, 2006. Interest income decreased in 2007 as available cash was utilized for drilling and equipping of wells during the
remainder of 2006 and into 2007.

Lease operations and production taxes. Lease operating expense during the three month period ended June 30, 2007
total $144,508 compared to $68,111 for the three month period ended June 30, 2006. Production taxes during the three month period ended June 30, 2007 total $169,209 as compared to $118,540 for the three month period ended June 30,
2006. Lease operating expenses and production taxes increased as additional wells were drilled and completed during 2006 and into 2007.

Depreciation,
depletion and amortization. Depreciation, depletion and amortization for the three month period ended June 30, 2007 total $539,749, compared to $720,798 for the three month period ended June 30, 2006. The decrease is due to a lower
amortizable base due to 2006 cost ceiling write-downs.

Cost ceiling write-down. There was no cost ceiling write-down for the three month period ended
June 30, 2007. There was a cost ceiling write-down of $3,259,177 for the three month period ended June 30, 2006, which was caused by the lower gas price at June 30, 2006.

Administrative and general expense. Administrative and general expense for the three month period ended June 30, 2007 total $104,649 compared to $61,002 for the period ended June 30, 2006. The overall
increase is due to increased administrative expenses allocated to the partnership by MOC and higher general expenses for reporting costs.



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Six months ended June 30, 2007 as compared to the six months ended June 30, 2006.

Oil and gas revenues



|                  |  |                           |           |      |   |          
|----------------- |  | ------------------------- | --------- | ---- | - | ---------
|                  |  | Six Months Ended June 30,
|                  |  | 2007                      |           | 2006
|Oil and gas sales |  | $                         | 4,332,509 |      | $ | 2,964,517
|Barrels produced  |  |                           | 11,168    |      |   | 3,609    
|Mcf produced      |  |                           | 531,345   |      |   | 442,135  
|Average price/bbl |  | $                         | 58.62     |      | $ | 64.98    
|Average price/mcf |  | $                         | 6.92      |      | $ | 6.17     

As shown in the table above, total oil and gas sales increased $1,367,992 (46.1%) for the six months ended
June 30, 2007 as compared to the six months ended June 30, 2006. Of this increase, $443,115 and $618,262, respectively, were related to increases in volumes of oil and gas sold. Volumes of oil and gas sold increased by 7,559 bbls of oil
and 89,210 mcf of gas for the six months ended June 30, 2007 as compared to the six months ended June 30, 2006. The increase in volumes of oil and gas sold was primarily due to the addition of seventeen new wells completed since
June 30, 2006. Also, an increase in the average price of gas resulted in an additional increase in gas sales of $329,580. These increases were partially offset by a decrease of $22,965 in oil sales for the six months ended June 30, 2007
due to a decrease in the average price of oil sold. The average oil price decreased to $58.62 per bbl for the six months ended June 3, 2007 from $64.98 per bbl for the six months ended June 30, 2006. The average gas price increased to
$6.92 per mcf for the six months ended June 30, 2007 from $6.17 for the six months ended June 30, 2006.

Interest income. Interest income was
$2,843 during the six months ended June 30, 2007 as compared to $239,519 during the six month period ended June 30, 2006. Interest income decreased in 2007 as available cash was utilized for drilling and equipping of wells during 2006 and
the six months ended June 30, 2007.

Lease operations and production taxes. Lease operating expense during the period ended June 30, 2007 total
$286,121 compared to $117,752 for the period ended June 30, 2006. Production taxes during the period ended June 30, 2007 total $333,502 as compared to $226,055 for the period ended June 30, 2006. Lease operating expenses and
production taxes increased as additional wells were drilled and completed during 2006 and the six months ended June 30, 2007.

Depreciation, depletion
and amortization. Depreciation, depletion and amortization for the six month period ended June 30, 2007 total $1,084,225, compared to $1,277,602 for the six month period ended June 30, 2006. The decrease is due to a lower amortizable base
due to 2006 cost ceiling write-downs.

Cost ceiling write-down. There was no cost ceiling write-down for the six month period ended June 30, 2007.
There was a cost ceiling write-down of $5,118,343 for the six month period ended June 30, 2006, which was caused by the lower gas price at June 30, 2006.

Administrative and general expense. Administrative and general expense for the six month period ended June 30, 2007 total $201,876 compared to $96,840 for the period ended June 30, 2006. The overall increase is due to increased
administrative expenses allocated to the partnership by MOC and higher general expenses for reporting costs.



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##### Table of Contents

|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 currently expects to sell a vast majority of its production from successful
oil and gas wells on a month-to-month basis at 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. For the six months ended June 30, 2007, a 10% change in the price received for natural gas production would have had an approximate $368,000 impact on our revenue.



|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 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 changes in MDs internal controls for the quarter ended June 30, 2007 or in other factors which have materially
affected, or are reasonably likely to materially affect the internal controls over financial reporting.



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Part II  Other Information



|Item 1. | Legal Proceedings
|------- | -----------------

None.



|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 14, 2007 |  |                                      |  |                                     
|                      |  |                                     
|                      |  | By:                                  |  | /s/ Alan Clark                      
|                      |  |                                      |  | Alan Clark, Treasurer and Controller



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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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