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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 September 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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##### Table of Contents

Mewbourne Energy Partners 05-A, L.P.

INDEX



|           |  |                                                                                                                                                               |  |         
|---------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | --------
|           |  |                                                                                                                                                               |  | Page No.
|Part  I   |  | Financial Information                                                                                                                                         |  |         
|           |  |                                                                                                                                                              
|Item 1.    |  | Financial Statements                                                                                                                                          |  |         
|           |  |                                                                                                                                                              
|           |  | Condensed Balance Sheets - September 30, 2007 (Unaudited) and December 31, 2006                                                                               |  | 3       
|           |  |                                                                                                                                                              
|           |  | Condensed Statements of Operations (Unaudited) - For the three months ended September 30, 2007 and 2006 and the nine months ended September 30, 2007 and 2006 |  | 4       
|           |  |                                                                                                                                                              
|           |  | Condensed Statements of Cash Flows (Unaudited) - For the nine months ended September 30, 2007 and 2006                                                        |  | 5       
|           |  |                                                                                                                                                              
|           |  | Condensed Statement of Changes In Partners Capital (Unaudited) - For the nine months ended September 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

September 30, 2007 and December 31, 2006



|                                                                      |  |                    |             |   |                   |   |             |  
|--------------------------------------------------------------------- |  | ------------------ | ----------- | - | ----------------- | - | ----------- | -
|                                                                      |  | September 30, 2007 |             |   | December 31, 2006 |  
|                                                                      |  | (Unaudited)        |             |   |                   |  
|ASSETS                                                                |  |                    |             |   |                   |   |             |  
|                                                                      |  |                   
|Cash                                                                  |  | $                  | 7,217       |   |                   | $ | 3,045       |  
|Accounts receivable, affiliate                                        |  |                    | 1,290,538   |   |                   |   | 1,551,686   |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total current assets                                                  |  |                    | 1,297,755   |   |                   |   | 1,554,731   |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Oil and gas properties at cost, full cost method                      |  |                    | 29,486,716  |   |                   |   | 28,739,898  |  
|Less accumulated depreciation, depletion, amortization and impairment |  |                    | (15,918,089 | ) |                   |   | (14,310,471 | )
|                                                                      |  |                    |             |   |                   |   |             |  
|                                                                      |  |                    | 13,568,627  |   |                   |   | 14,429,427  |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total assets                                                          |  | $                  | 14,866,382  |   |                   | $ | 15,984,158  |  
|                                                                      |  |                    |             |   |                   |   |             |  
|LIABILITIES AND PARTNERS CAPITAL                                     |  |                    |             |   |                   |   |             |  
|                                                                      |  |                   
|Accounts payable, affiliate                                           |  | $                  | 1,860,815   |   |                   | $ | 1,273,400   |  
|                                                                      |  |                   
|Asset retirement obligation                                           |  |                    | 108,323     |   |                   |   | 102,573     |  
|                                                                      |  |                   
|Partners capital                                                     |  |                    |             |   |                   |   |             |  
|General partners                                                      |  |                    |            |   |                   |   | 13,075,951  |  
|Limited partners                                                      |  |                    | 12,897,244  |   |                   |   | 1,532,234   |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total partners capital                                               |  |                    | 12,897,244  |   |                   |   | 14,608,185  |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total liabilities and partners capital                               |  | $                  | 14,866,382  |   |                   | $ | 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 September 30, 2007 and 2006 and

the nine months ended September 30, 2007 and 2006

(Unaudited)



|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|----------------------------------------------------------------------------------------------------------- |  | ------------------------------- | --------- | - | ------------------------------ | - | ---------- | ---- |  | - | --------- | - |  | - | ---------- | -
|                                                                                                            |  | Three Months EndedSeptember 30, |           |   | Nine Months EndedSeptember 30, |  
|                                                                                                            |  | 2007                            |           |   | 2006                           |   |            | 2007 |  |   | 2006      |  
|Revenues and other income:                                                                                  |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|                                                                                                            |  |                                 |           |  
|Oil and gas sales                                                                                           |  | $                               | 2,021,027 |   |                                | $ | 2,648,015  |      |  | $ | 6,353,536 |   |  | $ | 5,612,532  |  
|Interest income                                                                                             |  |                                 | 951       |   |                                |   | 27,356     |      |  |   | 3,794     |   |  |   | 266,875    |  
|Loss on settlement of ARO                                                                                   |  |                                 | (313      | ) |                                |   |           |      |  |   | (313      | ) |  |   |           |  
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Total revenues and other income                                                                             |  |                                 | 2,021,665 |   |                                |   | 2,675,371  |      |  |   | 6,357,017 |   |  |   | 5,879,407  |  
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Expenses:                                                                                                   |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Lease operating expense                                                                                     |  |                                 | 137,895   |   |                                |   | 142,246    |      |  |   | 424,016   |   |  |   | 259,998    |  
|Production taxes                                                                                            |  |                                 | 159,148   |   |                                |   | 211,085    |      |  |   | 492,650   |   |  |   | 437,140    |  
|Administrative and general expense                                                                          |  |                                 | 86,048    |   |                                |   | 71,229     |      |  |   | 287,924   |   |  |   | 168,070    |  
|Depreciation, depletion, and amortization                                                                   |  |                                 | 523,393   |   |                                |   | 985,536    |      |  |   | 1,607,618 |   |  |   | 2,263,138  |  
|Cost ceiling write-down                                                                                     |  |                                 |          |   |                                |   | 6,120,960  |      |  |   |          |   |  |   | 11,239,303 |  
|Asset retirement obligation accretion                                                                       |  |                                 | 1,917     |   |                                |   | 1,614      |      |  |   | 5,750     |   |  |   | 3,716      |  
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Total expenses                                                                                              |  |                                 | 908,401   |   |                                |   | 7,532,670  |      |  |   | 2,817,958 |   |  |   | 14,371,365 |  
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Net income (loss)                                                                                           |  | $                               | 1,113,264 |   |                                | $ | (4,857,299 | )    |  | $ | 3,539,059 |   |  | $ | (8,491,958 | )
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Allocation of net income (loss):                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|General partners                                                                                            |  | $                               |          |   |                                | $ | (4,344,692 | )    |  | $ |          |   |  | $ | (7,595,773 | )
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Limited partners                                                                                            |  | $                               | 1,113,264 |   |                                | $ | (512,607   | )    |  | $ | 3,539,059 |   |  | $ | (896,185   | )
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  
|Basic and diluted net income (loss) per limited and general partner interest (30,000 interests outstanding) |  | $                               | 37.11     |   |                                | $ | (161.91    | )    |  | $ | 117.97    |   |  | $ | (283.07    | )
|                                                                                                            |  |                                 |           |   |                                |   |            |      |  |   |           |   |  |   |            |  

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 nine months ended September 30, 2007 and 2006

(Unaudited)



|                                                                                         |  |      |            |   |      |   |             |  
|---------------------------------------------------------------------------------------- |  | ---- | ---------- | - | ---- | - | ----------- | -
|                                                                                         |  | 2007 |            |   | 2006 |  
|Cash flows from operating activities:                                                    |  |      |            |   |      |   |             |  
|Net income (loss)                                                                        |  | $    | 3,539,059  |   |      | $ | (8,491,958  | )
|Adjustments to reconcile net income (loss) to net cash provided by operating activities: |  |      |            |   |      |   |             |  
|Loss on settlement of ARO                                                                |  |      | 313        |   |      |   |            |  
|Depreciation, depletion, and amortization                                                |  |      | 1,607,618  |   |      |   | 2,263,138   |  
|Cost ceiling write-down                                                                  |  |      |           |   |      |   | 11,239,303  |  
|Asset retirement obligation accretion                                                    |  |      | 5,750      |   |      |   | 3,716       |  
|Changes in operating assets and liabilities:                                             |  |      |            |   |      |   |             |  
|Accounts receivable, affiliate                                                           |  |      | 261,148    |   |      |   | (1,545,739  | )
|Accounts receivable, other                                                               |  |      |           |   |      |   | 68,259      |  
|Accounts payable, affiliate                                                              |  |      | 587,415    |   |      |   | 958,588     |  
|                                                                                         |  |      |            |   |      |   |             |  
|Net cash provided by operating activities                                                |  |      | 6,001,303  |   |      |   | 4,495,307   |  
|                                                                                         |  |      |            |   |      |   |             |  
|Cash flows from investing activities:                                                    |  |      |            |   |      |   |             |  
|Purchase and development of oil and gas properties                                       |  |      | (747,131   | ) |      |   | (11,938,511 | )
|                                                                                         |  |      |            |   |      |   |             |  
|Net cash used in investing activities                                                    |  |      | (747,131   | ) |      |   | (11,938,511 | )
|                                                                                         |  |      |            |   |      |   |             |  
|Cash flows from financing activities:                                                    |  |      |            |   |      |   |             |  
|Cash distributions to partners                                                           |  |      | (5,250,000 | ) |      |   | (4,435,000  | )
|                                                                                         |  |      |            |   |      |   |             |  
|Net cash used in financing activities                                                    |  |      | (5,250,000 | ) |      |   | (4,435,000  | )
|                                                                                         |  |      |            |   |      |   |             |  
|Net increase (decrease) in cash and cash equivalents                                     |  |      | 4,172      |   |      |   | (11,878,204 | )
|Cash and cash equivalents, beginning of period                                           |  |      | 3,045      |   |      |   | 12,773,922  |  
|                                                                                         |  |      |            |   |      |   |             |  
|Cash and cash equivalents, end of period                                                 |  | $    | 7,217      |   |      | $ | 895,718     |  
|                                                                                         |  |      |            |   |      |   |             |  

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 nine months ended September 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                                                   |  |                 |            |   |                 |   | (5,250,000 | )     |  |   | (5,250,000 | )
|Net income                                                           |  |                 |            |   |                 |   | 3,539,059_ |       |  |   | 3,539,059_ |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  
|Balance at September 30, 2007                                        |  | $               |            |   |                 | $ | 12,897,244 |       |  | $ | 12,897,244 |  
|                                                                     |  |                 |             |   |                 |   |            |       |  |   |            |  

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. Of this
amount, $27,450,000 was available after sales commissions and due diligence fees were paid. 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 September 30, 2007, all capitalized costs were subject to
amortization while at September 30, 2006, approximately $130,000 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 at September 30, 2007. There was a cost ceiling
write-down of $11,239,303 at September 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 nine months ended
September 30, 2007 and the year ended December 31, 2006 is as follows:



|                             |  |                   |         |                  |   |        
|---------------------------- |  | ----------------- | ------- | ---------------- | - | -------
|                             |  | September 30,2007 |         | December 31,2006
|Balance, beginning of period |  | $                 | 102,573 |                  | $ | 26,373 
|Liabilities incurred         |  |                   |        |                  |   | 70,864 
|Accretion expense            |  |                   | 5,750   |                  |   | 5,336  
|                             |  |                   |         |                  |   |        
|Balance, end of period       |  | $                 | 108,323 |                  | $ | 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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##### Table of Contents

|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 $(563,060) at September 30, 2007. The Partnership anticipates retaining revenue to increase working capital.

During the nine months ended September 30, 2007, the Partnership made cash distributions to the investor partners in the amount of $5,250,000 as compared to
$4,435,000 for the nine months ended September 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 September 30, 2007 as compared to the three months ended September 30, 2006.

Oil and gas revenues



|                  |  |                                  |           |      |   |          
|----------------- |  | -------------------------------- | --------- | ---- | - | ---------
|                  |  | Three Months Ended September 30,
|                  |  | 2007                             |           | 2006
|Oil and gas sales |  | $                                | 2,021,027 |      | $ | 2,648,015
|Barrels produced  |  |                                  | 7,535     |      |   | 5,745    
|Mcf produced      |  |                                  | 255,997   |      |   | 390,144  
|Average price/bbl |  | $                                | 72.76     |      | $ | 66.89    
|Average price/mcf |  | $                                | 5.75      |      | $ | 5.80     

As shown in the table above, total oil and gas sales decreased $626,988 (23.7%) for the three months ended
September 30, 2007 as compared to the three months ended September 30, 2006. Of this, $770,552 was related to a decrease in the volume of gas sold to 255,997 mcf for the three months ended September 30, 2007 from 390,144 mcf for the
three months ended September 30, 2006. This was partially offset by an increase of $130,226 in oil sales due to an increase in the volume of oil sold to 7,535 barrels for the three months ended September 30, 2007 from 5,745 barrels for the
three months ended September 30, 2006. The decrease in volume of gas sold was due to normal declines in production, which in some wells was substantial. This was partially offset by an increase in the volume of oil sold. Also, oil sales
increased by $33,749 due to an increase in the average price to $72.76 per barrel for the three months ended September 30, 2007 from $66.89 per barrel for the three months ended September 30, 2006. This increase was partially offset by a
decrease of $20,411 in gas sales related to a decrease in the average gas price to $5.75 per mcf for the three months ended September 30, 2007 from $5.80 per mcf for the three months ended September 30, 2006.

Interest income. Interest income was $951 for the three months ended September 30, 2007 as compared to $27,356 for the three month period ended September 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 for the three months ended September 30, 2007 were comparable to those for the three months ended September 30, 2006. Production taxes for the three months ended
September 30, 2007 total $159,148 as compared to $211,085 for the three months ended September 30, 2006. The decrease in production taxes was due to the decrease in sales.

Depreciation, depletion and amortization. Depreciation, depletion and amortization for the three months ended September 30, 2007 total $523,393, compared to $985,536 for the three months ended September 30,
2006. The decrease is due to reduced gas production and to a lower amortizable base related to the September 30, 2006 cost ceiling write-down.

Cost
ceiling write-down. There was no cost ceiling write-down at September 30, 2007. There was a cost ceiling write-down of $6,120,960 at September 30, 2006, which was caused by the lower gas price at September 30, 2006.

Administrative and general expense. Administrative and general expense for the three months ended September 30, 2007 total $86,048 compared to $71,229 for the three
months ended September 30, 2006. The overall increase is due to increased administrative expenses allocable to the partnership, which was partially offset by lower general expenses for reporting costs.



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Nine months ended September 30, 2007 as compared to the nine months ended September 30, 2006.

Oil and gas revenues



|                  |  |                                 |           |      |   |          
|----------------- |  | ------------------------------- | --------- | ---- | - | ---------
|                  |  | Nine Months Ended September 30,
|                  |  | 2007                            |           | 2006
|Oil and gas sales |  | $                               | 6,353,536 |      | $ | 5,612,532
|Barrels produced  |  |                                 | 18,702    |      |   | 9,354    
|Mcf produced      |  |                                 | 787,342   |      |   | 832,279  
|Average price/bbl |  | $                               | 64.32     |      | $ | 66.15    
|Average price/mcf |  | $                               | 6.54      |      | $ | 6.00     

As shown in the table above, total oil and gas sales increased $741,004 (13.2%) for the nine months ended
September 30, 2007 as compared to the nine months ended September 30, 2006. Of this increase, $601,261 was related to an increase in the volume of oil sold, to 18,702 barrels of oil for the nine months ended September 30, 2007 from
9,354 barrels for the nine months ended September 30, 2006. This was partially offset by a $292,492 decrease due to the decrease in the volume of gas sold to 787,342 mcf for the nine months ended September 30, 2007 from 832,279 for the
nine months ended September 30, 2006. The decrease in volume of gas sold was due to normal declines in production, which in some wells was substantial. This was partially offset by an increase in the volume of oil sold. Also, gas sales
increased by $449,371 due to the increase in the average price of gas to $6.54 per mcf for the nine months ended September 30, 2007 from $6.00 per mcf for the nine months ended September 30, 2006. This was partially offset by a $17,136
decrease in oil sales due to the decrease in the average price of oil to $64.32 per barrel for the nine months ended September 30, 2007 from $66.15 per barrel for the nine months ended September 30, 2006.

Interest income. Interest income was $3,794 during the nine months ended September 30, 2007 as compared to $266,875 during the nine months ended September 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 nine months ended September 30, 2007 total $424,016 compared to $259,998 for the nine months ended September 30, 2006 as more wells were active and
producing for the entire nine month period in 2007. Production taxes for the nine months ended September 30, 2007 total $492,650 as compared to $437,140 for the nine months ended September 30, 2006 due to increased sales.

Depreciation, depletion and amortization. Depreciation, depletion and amortization for the nine months ended September 30, 2007 total $1,607,618, compared to
$2,263,138 for the nine months ended September 30, 2006. The decrease is due to a lower amortizable base due to the September 30, 2006 cost ceiling write-down.

Cost ceiling write-down. There was no cost ceiling write-down at September 30, 2007. There was a cost ceiling write-down of $11,239,303 at September 30, 2006, which was caused by the lower gas prices on
March 31, 2006, June 30, 2006 and September 30, 2006.

Administrative and general expense. Administrative and general expense for the
nine months ended September 30, 2007 total $287,924 compared to $168,070 for the nine months ended September 30, 2006. The overall increase is due to increased administrative expenses allocable to the partnership and higher general
expenses for reporting costs.



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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 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 nine months ended September 30, 2007, a 10% change in the price received for natural gas production would have had an approximate $515,000 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 September 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: November 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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