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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549





FORM 10-Q







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

For the quarterly period ended September 30, 2008

OR



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

For the transition period from  to

Commission File No. 333-113340





MEWBOURNE ENERGY PARTNERS 05-A, L.P.







|                                                        |  |                                       
|------------------------------------------------------- |  | --------------------------------------
|Delaware                                                |  | 20-2306210                            
|(State or jurisdiction ofincorporation or organization) |  | (I.R.S. EmployerIdentification 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)





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, a non-accelerated filer, or a smaller reporting company in Rule 12b-2
of the Exchange Act. (Check one):



|                        |  |                                                  |  |                           |  |  
|----------------------- |  | ------------------------------------------------ |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈                                                |  | Accelerated filer         |  |  ̈
|                        |  |                                                  | 
|Non-accelerated filer   |  |  ̈  (Do not check if a smaller reporting company) |  | Smaller reporting company |  | 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 1 - Financial Information                                                                 |  |                                                                                                                                                               
|                                                                                               | 
|Item 1. Financial Statements                                                                   |  |                                                                                                                                                               
|                                                                                               |  |                                                                                                                                                               
|                                                                                               |  | Condensed Balance Sheets - September 30, 2008 (Unaudited) and December 31, 2007                                                                                |  | 3       
|                                                                                               |  |                                                                                                                                                               
|                                                                                               |  | Condensed Statements of Operations (Unaudited) - For the three months ended September 
30, 2008 and 2007 and the nine months ended September 30, 2008 and 2007 |  | 4       
|                                                                                               |  |                                                                                                                                                               
|                                                                                               |  | Condensed Statements of Cash Flows (Unaudited) - For the nine months ended September 30, 2008 and
2007                                                         |  | 5       
|                                                                                               |  |                                                                                                                                                               
|                                                                                               |  | Condensed Statement of Changes In Partners Capital (Unaudited) - For the nine months ended September 30,
2008                                                 |  | 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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MEWBOURNE ENERGY PARTNERS 05-A, L.P.

Part I - Financial Information



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

CONDENSED
BALANCE SHEETS

SEPTEMBER 30, 2008 AND DECEMBER 31, 2007



|                                                                      |  |                    |             |   |                   |   |             |  
|--------------------------------------------------------------------- |  | ------------------ | ----------- | - | ----------------- | - | ----------- | -
|                                                                      |  | September 30, 2008 |             |   | December 31, 2007 |  
|                                                                      |  | (Unaudited)        |             |   |                   |  
|ASSETS                                                                |  |                    |             |   |                   |   |             |  
|Cash                                                                  |  | $                  | 34,996      |   |                   | $ | 2,596       |  
|Accounts receivable, affiliate                                        |  |                    | 1,651,793   |   |                   |   | 1,305,072   |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total current assets                                                  |  |                    | 1,686,789   |   |                   |   | 1,307,668   |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Oil and gas properties at cost, full-cost method                      |  |                    | 29,930,985  |   |                   |   | 29,694,477  |  
|Less accumulated depreciation, depletion, amortization and impairment |  |                    | (17,631,104 | ) |                   |   | (16,342,583 | )
|                                                                      |  |                    |             |   |                   |   |             |  
|                                                                      |  |                    | 12,299,881  |   |                   |   | 13,351,894  |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total assets                                                          |  | $                  | 13,986,670  |   |                   | $ | 14,659,562  |  
|                                                                      |  |                    |             |   |                   |   |             |  
|                                                                      |  |                   
|LIABILITIES AND PARTNERS CAPITAL                                     |  |                    |             |   |                   |   |             |  
|Accounts payable, affiliate                                           |  | $                  | 738,199     |   |                   | $ | 1,966,220   |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total current liabilities                                             |  |                    | 738,199     |   |                   |   | 1,966,220   |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Asset retirement obligation                                           |  |                    | 118,827     |   |                   |   | 110,239     |  
|Partners capital                                                     |  |                    | 13,129,644  |   |                   |   | 12,583,103  |  
|                                                                      |  |                    |             |   |                   |   |             |  
|Total liabilities and partners capital                               |  | $                  | 13,986,670  |   |                   | $ | 14,659,562  |  
|                                                                      |  |                    |             |   |                   |   |             |  

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, 2008 and 2007 and

the nine months ended September 30, 2008 and 2007

(Unaudited)



|                                                                                         |  |                                 |           |                                |   |           |  |      |           |  |   |          
|---------------------------------------------------------------------------------------- |  | ------------------------------- | --------- | ------------------------------ | - | --------- |  | ---- | --------- |  | - | ---------
|                                                                                         |  | Three Months EndedSeptember 30, |           | Nine Months EndedSeptember 30,
|                                                                                         |  | 2008                            |           | 2007                           |   | 2008      |  | 2007
|Revenues and other income                                                                |  |                                 |           |                                |   |           |  |      |           |  |   |          
|Oil sales                                                                                |  | $                               | 436,864   |                                | $ | 548,254   |  | $    | 1,260,391 |  | $ | 1,202,924
|Gas sales                                                                                |  |                                 | 2,349,765 |                                |   | 1,472,773 |  |      | 6,309,821 |  |   | 5,150,612
|Interest income                                                                          |  |                                 | 288       |                                |   | 951       |  |      | 1,014     |  |   | 3,794    
|                                                                                         |  |                                 |           |                                |   |           |  |      |           |  |   |          
|Total revenues and other income                                                          |  |                                 | 2,786,917 |                                |   | 2,021,978 |  |      | 7,571,226 |  |   | 6,357,330
|                                                                                         |  |                                 |           |                                |   |           |  |      |           |  |   |          
|Expenses                                                                                 |  |                                 |           |                                |   |           |  |      |           |  |   |          
|Lease operating expense                                                                  |  |                                 | 122,627   |                                |   | 137,895   |  |      | 392,299   |  |   | 424,016  
|Production taxes                                                                         |  |                                 | 167,586   |                                |   | 159,148   |  |      | 497,530   |  |   | 492,650  
|Administrative and general expense                                                       |  |                                 | 96,762    |                                |   | 86,048    |  |      | 278,814   |  |   | 287,924  
|Depreciation, depletion, and amortization                                                |  |                                 | 488,028   |                                |   | 523,393   |  |      | 1,288,520 |  |   | 1,607,618
|Asset retirement obligation accretion                                                    |  |                                 | 2,763     |                                |   | 2,230     |  |      | 6,883     |  |   | 6,063    
|                                                                                         |  |                                 |           |                                |   |           |  |      |           |  |   |          
|Total expenses                                                                           |  |                                 | 877,766   |                                |   | 908,714   |  |      | 2,464,046 |  |   | 2,818,271
|                                                                                         |  |                                 |           |                                |   |           |  |      |           |  |   |          
|Net income                                                                               |  | $                               | 1,909,151 |                                | $ | 1,113,264 |  | $    | 5,107,180 |  | $ | 3,539,059
|                                                                                         |  |                                 |           |                                |   |           |  |      |           |  |   |          
|Basic and diluted net income per limited partner interest (30,000 interests outstanding) |  | $                               | 63.64     |                                | $ | 37.11     |  | $    | 170.24    |  | $ | 117.97   

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, 2008 and 2007

(Unaudited)



|                                                                                            |  |                                |            |   |      |   |            |  
|------------------------------------------------------------------------------------------- |  | ------------------------------ | ---------- | - | ---- | - | ---------- | -
|                                                                                            |  | Nine Months EndedSeptember 30, |           
|                                                                                            |  | 2008                           |            |   | 2007 |  
|Cash flows from operating activities:                                                       |  |                                |            |   |      |   |            |  
|Net income                                                                                  |  | $                              | 5,107,180  |   |      | $ | 3,539,059  |  
|Adjustments to reconcile net income to net cash provided by operating activities:           |  |                                |            |   |      |   |            |  
|Depreciation, depletion, and amortization                                                   |  |                                | 1,288,520  |   |      |   | 1,607,618  |  
|Asset retirement obligation accretion                                                       |  |                                | 6,883      |   |      |   | 6,063      |  
|Changes in operating assets and liabilities:                                                |  |                                |            |   |      |   |            |  
|Accounts receivable, affiliate                                                              |  |                                | (346,721   | ) |      |   | 261,148    |  
|Accounts payable, affiliate                                                                 |  |                                | (1,228,021 | ) |      |   | 587,415    |  
|                                                                                            |  |                                |            |   |      |   |            |  
|Net cash provided by operating activities                                                   |  |                                | 4,827,841  |   |      |   | 6,001,303  |  
|                                                                                            |  |                                |            |   |      |   |            |  
|Cash flows from investing activities:                                                       |  |                                |            |   |      |   |            |  
|Purchase and development of oil and gas properties                                          |  |                                | (234,802   | ) |      |   | (747,131   | )
|                                                                                            |  |                                |            |   |      |   |            |  
|Net cash used in investing activities                                                       |  |                                | (234,802   | ) |      |   | (747,131   | )
|                                                                                            |  |                                |            |   |      |   |            |  
|Cash flows from financing activities:                                                       |  |                                |            |   |      |   |            |  
|Cash distributions to partners                                                              |  |                                | (4,560,639 | ) |      |   | (5,250,000 | )
|                                                                                            |  |                                |            |   |      |   |            |  
|Net cash used in financing activities                                                       |  |                                | (4,560,639 | ) |      |   | (5,250,000 | )
|                                                                                            |  |                                |            |   |      |   |            |  
|Net increase in cash                                                                        |  |                                | 32,400     |   |      |   | 4,172      |  
|Cash, beginning of period                                                                   |  |                                | 2,596      |   |      |   | 3,045      |  
|                                                                                            |  |                                |            |   |      |   |            |  
|Cash, end of period                                                                         |  | $                              | 34,996     |   |      | $ | 7,217      |  
|                                                                                            |  |                                |            |   |      |   |            |  
|Supplemental Cash Flow Information:                                                         |  |                                |            |   |      |   |            |  
|Non-cash changes to oil & gas properties related to asset retirement obligation liabilities |  | $                              | 2,347      |   |      | $ |           |  
|                                                                                            |  |                                |            |   |      |   |            |  

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, 2008

(Unaudited)



|                              |  |                   |            |  
|----------------------------- |  | ----------------- | ---------- | -
|                              |  | Partners Capital |           
|Balance at December 31, 2007  |  | $                 | 12,583,103 |  
|Cash distributions            |  |                   | (4,560,639 | )
|Net income                    |  |                   | 5,107,180  |  
|                              |  |                   |            |  
|Balance at September 30, 2008 |  | $                 | 13,129,644 |  
|                              |  |                   |            |  

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 2007, 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.

We adopted the provisions of Statement of Financial Accounting Standards No. 157, Fair Value Measurements on January 1,
2008. SFAS No. 157 defines fair value, establishes a market-based framework or hierarchy for measuring fair value, and expands disclosures about fair value measurements. SFAS No. 157 is applicable whenever another accounting pronouncement
requires or permits assets and liabilities to be measured at fair value. SFAS No. 157 does not expand or require any new fair value measures. However, the application of this statement may change current practice. In February 2008, the FASB
decided that an entity need not apply this standard to non-financial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a nonrecurring basis until 2009. Accordingly, our adoption of this standard in
2008 was limited to financial assets and liabilities. The adoption of SFAS No. 157 did not impact our financial position, results of operations, or cash flows. We are still in the process of evaluating this standard with respect to its effect
on non-financial assets and liabilities and therefore have not yet determined the impact that it will have on our financial statements upon full adoption in 2009. Non-financial assets and liabilities for which we have not applied the provisions of
SFAS No. 157 include those measured at fair value in impairment testing.



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|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
2007, all general partner equity interests were converted to limited partner equity 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 significant 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, 2008 and 2007, all capitalized costs were subject
to 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.



|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, 2008 and the year ended December 31, 2007 is as follows:



|                             |  |                    |         |                   |   |        
|---------------------------- |  | ------------------ | ------- | ----------------- | - | -------
|                             |  | September 30, 2008 |         | December 31, 2007
|Balance, beginning of period |  | $                  | 110,239 |                   | $ | 102,573
|Liabilities incurred         |  |                    | 1,705   |                   |   |       
|Accretion expense            |  |                    | 6,883   |                   |   | 7,666  
|                             |  |                    |         |                   |   |        
|Balance, end of period       |  | $                  | 118,827 |                   | $ | 110,239
|                             |  |                    |         |                   |   |        



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|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 significant 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.

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) | As noted above, pursuant to the Program, MD must contribute 100% of organization and offering costs and lease acquisition costs which should 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 2007, all general partner equity interests were converted to limited partner equity
interests.

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 $948,590 at September 30, 2008.

During the nine months ended September 30, 2008, the
Partnership made cash distributions to the investor partners in the amount of $4,560,639 as compared to $5,250,000 for the nine months ended September 30, 2007. The Partnership expects that cash distributions will continue during 2008 as
additional oil and gas revenues are sufficient to produce cash flows from operations.

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



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Results of Operations

For the three months ended September 30, 2008 as compared to the three months ended September 30, 2007:



|                  |  |                                  |           |      |   |          
|----------------- |  | -------------------------------- | --------- | ---- | - | ---------
|                  |  | Three Months Ended September 30,
|                  |  | 2008                             |           | 2007
|Oil sales         |  | $                                | 436,864   |      | $ | 548,254  
|Barrels produced  |  |                                  | 3,812     |      |   | 7,535    
|Average price/bbl |  | $                                | 114.60    |      | $ | 72.76    
|Gas sales         |  | $                                | 2,349,765 |      | $ | 1,472,773
|Mcf produced      |  |                                  | 262,290   |      |   | 255,997  
|Average price/mcf |  | $                                | 8.96      |      | $ | 5.75     

Oil and gas revenues. As shown in the table above, total oil and gas sales increased $765,602, a 37.9% increase,
for the three months ended September 30, 2008 as compared to the three months ended September 30, 2007.

Of this increase, $315,274 and $820,615
were due to increases in average prices of oil and gas sold, respectively. Average prices rose to $114.60 from $72.76 per bbl and to $8.96 from $5.75 per mcf for the three months ended September 30, 2008 as compared to the three months ended
September 30, 2007. In addition, an increase of $56,377 relates to increased volumes of gas sold. Volumes of gas increased 6,293 mcf of gas for the three months ended September 30, 2008 as compared to the three months ended
September 30, 2007. This increase in volumes of gas sold was due to increased production in several wells.

These increases were partially offset by a
decrease of $426,664 related to a decrease in volumes of oil sold. Volumes decreased 3,723 bbls of oil for the three months ended September 30, 2008 as compared to the three months ended September 30, 2007. This decrease in volumes of oil
sold was due to normal declines in production, which in some wells was substantial.

Production taxes. Production taxes during the three month period ended
September 30, 2008 increased to $167,586 from $159,148 for the three month period ended September 30, 2007. This increase was due to increased revenue and was partially offset by high cost gas well production tax credits.

Lease operations. Lease operating expense during the three month period ended September 30, 2008 decreased to $122,627 from $137,895 for the three month period
ended September 30, 2007 due to decreased well repairs and workovers.

Depreciation, depletion and amortization. Depreciation, depletion and
amortization for the three month period ended September 30, 2008 decreased to $488,028 from $523,393 for the three month period ended September 30, 2007. This decrease was due to the overall decline in production volumes.

Administrative and general expense. Administrative and general expense for the three month period ended September 30, 2008 totaled $96,762 compared to $86,048 for
the three month period ended September 30, 2007. The overall increase was due to increased administrative expenses allocable to the partnership, which was partially offset by lower general expenses for reporting costs.



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Results of Operations

For the nine months ended September 30, 2008 as compared to the nine months ended September 30, 2007:



|                  |  |                                 |           |      |   |          
|----------------- |  | ------------------------------- | --------- | ---- | - | ---------
|                  |  | Nine Months Ended September 30,
|                  |  | 2008                            |           | 2007
|Oil sales         |  | $                               | 1,260,391 |      | $ | 1,202,924
|Barrels produced  |  |                                 | 11,343    |      |   | 18,702   
|Average price/bbl |  | $                               | 111.12    |      | $ | 64.32    
|Gas sales         |  | $                               | 6,309,821 |      | $ | 5,150,612
|Mcf produced      |  |                                 | 709,610   |      |   | 787,342  
|Average price/mcf |  | $                               | 8.89      |      | $ | 6.54     

Oil and gas revenues. As shown in the table above, total oil and gas sales increased $1,216,676, a 19.1% increase,
for the nine months ended September 30, 2008 as compared to the nine months ended September 30, 2007.

Of this increase, $875,171 and $1,850,399
were due to increases in the average prices of oil and gas sold, respectively. Average prices increased to $111.12 from $64.32 per bbl and to $8.89 from $6.54 per mcf for the nine months ended September 30, 2008 as compared to the nine months
ended September 30, 2007.

This increase was partially offset by decreases of $817,704 and $691,190 related to decreases in volumes of oil and gas
sold, respectively. Volumes of oil and gas sold decreased 7,359 bbls of oil and 77,732 mcf of gas for the nine months ended September 30, 2008 as compared to the nine months ended September 30, 2007. These decreases in volumes of oil and
gas sold were primarily due to normal declines in production.

Production taxes. Production taxes during the nine month period ended September 30,
2008 increased to $497,530 from $492,650 for the nine month period ended September 30, 2007. This increase was due to increased revenue and was partially offset by high cost gas well production tax credits.

Lease operations. Lease operating expense during the nine month period ended September 30, 2008 decreased to $392,299 from $424,016 for the nine month period ended
September 30, 2007 due to decreased well repairs and workovers.

Depreciation, depletion and amortization. Depreciation, depletion and amortization
for the nine month period ended September 30, 2008 decreased to $1,288,520 from $1,607,618 for the nine month period ended September 30, 2007. This decrease was due to the decline in production volumes.

Administrative and general expense. Administrative and general expense for the nine month period ended September 30, 2008 totaled $278,814 compared to $287,924 for
the nine month period ended September 30, 2007. The overall decrease was due to decreased administrative expenses allocable to the Partnership for the nine month period ended September 30, 2008 and lower 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 significant amount 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, 2008, a 10% change in the price received for natural gas production would have had an approximate
$631,000 impact on 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. Since MDs December 31, 2007 annual report on internal control over financial reporting, and for the quarter ended September 30,
2008, there have been no changes in MDs internal controls 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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##### Table of Contents

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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##### Table of Contents

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, 2008 |  |                                      |  |                                                           
|                        |  | By:                                  |  | /s/ Alan Clark                                            
|                        |  |                                      |  | Alan Clark, Treasurer and Controller                      



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##### Table of Contents

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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