|                        | **United                  States Securities and Exchange Commission**         |
|-----------------------------|-------------------------------------------------------------------------------|
|                        |                                                                          |
|                        | **Washington,                  D.C. 20549**                                   |
|                        |                                                                          |
|                        | **Form                  10-QSB**                                              |
|                        |                                                                          |
| (Mark                  One) |                                                                          |
|                        |                                                                          |
| **R**                       | **QUARTERLY                  REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE** |
|                        | **SECURITIES                  EXCHANGE ACT OF 1934**                          |
|                        | For                  the quarterly period ended March 31, 2006                |
|                        |                                                                          |
| o                           | **TRANSITION                  REPORT UNDER SECTION 13 OR 15 (d) OF THE**      |
|                        | **SECURITIES                  EXCHANGE ACT OF 1934**                          |
|                        |                                                                          |
|                        | For                  the transition period from _____ to _____                |
|                        |                                                                          |
|                        | Commission                  file number 333-127355                            |
|                        |                                                                          |
|                        |                                                                          |
|                        | **ATLAS                  AMERICA PUBLIC #15-2005 (A) L.P.**                   |
|                        | (Name                  of small business issuer in its charter)               |
|                        |                                                                          |

|                                                                                                                                                                                    |                                                                  |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------|
|                                                                                                                                                                                    |                                                                  |
| **Delaware**                                                                                                                                                                            | **20-3208344**                                                        |
| (State                  or other jurisdiction ofincorporation                  or organization)                                                                                         | (I.R.S.                  EmployerIdentification                  No.) |
|                                                                                                                                                                                    |                                                                  |
| 311                  Rouser Road                                                                                                                                                        | 15108                                                                 |
| Moon                  Township, PA                                                                                                                                                      | (zip                  code)                                           |
| (Address                  of principal executive offices)                                                                                                                               |                                                                  |
|                                                                                                                                                                                    |                                                                  |
| Issuer’s                  telephone number, including area code: **(412)                  262-2830**                                                                              |
|                                                                                                                                                                                    |
| Check                  whether the issuer (1) filed all reports required to be filed by                  Section                  13 or 15 (d) of the Exchange Act                      |
| during                  the past 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** ****R**                  No                  o |
|                                                                                                                                                                                    |
| Indicate                  by check mark whether the registrant is an accelerated filer (as                  defined                  in Rule 12b-2 of the                               |
| Exchange                  Act). Yes o                  No** ****R**                                                                                                                |
|                                                                                                                                                                                    |
| Indicate                  by check mark whether the registrant is a shell company (as defined                  in                  Rule 12b-2 of the Exchange Act)                      |
| Yes                  o                  No                  **R**                                                                                                                       |
|                                                                                                                                                                                    |
| Transitional                  Small Business Disclosure Format (check one): Yes o                  No                  **R**                                                            |

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**INDEX        TO QUARTERLY REPORT**

**ON        FORM 10QSB**

| **PART                  I.**  |   | **FINANCIAL                  INFORMATION**                                                                                      | **PAGE** |
|-------------------------------|--------|---------------------------------------------------------------------------------------------------------------------------------|----------|
|                          |   |                                                                                                                            |     |
| Item                  1:      |   | Financial                  Statements                                                                                           |     |
|                          |   |                                                                                                                            |     |
|                          |   | Balance                  Sheets as of March 31, 2006 and December 31, 2005                  (Unaudited)                         | 3        |
|                          |   |                                                                                                                            |     |
|                          |   | Statement                  of Operations for the Three Months ended March 31, 2006                                              |     |
|                          |   | (Unaudited)                                                                                                                     | 4        |
|                          |   |                                                                                                                            |     |
|                          |   | Statement                  of Partners’ Capital Accounts for the Three Months ended March 31,                  2006       |     |
|                          |   | (Unaudited)                                                                                                                     | 5        |
|                          |   |                                                                                                                            |     |
|                          |   | Statement                  of Cash Flows for the Three Months ended March 31, 2006                  (Unaudited)                 | 6        |
|                          |   |                                                                                                                            |     |
|                          |   | Notes                  to Financial Statements (Unaudited)                                                                      | 7-13     |
|                          |   |                                                                                                                            |     |
| Item                  2:      |   | Management’s                  Discussion and Analysis of Financial Condition or Plan of                  Operations  | 13-15    |
|                          |   |                                                                                                                            |     |
| Item                  3:      |   | Controls                  and Procedures                                                                                        | 15       |
|                          |   |                                                                                                                            |     |
| **PART                  II.** |   | **OTHER                  INFORMATION**                                                                                          |     |
|                          |   |                                                                                                                            |     |
| Item                  6:      |   | Exhibits                                                                                                                        | 16       |
|                          |   |                                                                                                                            |     |
|                          |   |                                                                                                                            |     |
| **SIGNATURES**           | 17     |
|                          |   |                                                                                                                            |     |
| **CERTIFICATIONS**       | 18-21  |

----

**PART        I**

**ITEM        1.**
**FINANCIAL        STATEMENTS**

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**BALANCE        SHEET**
**S**

|                                                                                                              |   | **March                  31,** |       | **December                  31,** |   |
|-------------------------------------------------------------------------------------------------------------------|--------|--------------------------------|------------|-----------------------------------|--------|
|                                                                                                              |   | **2006**                       |       | **2005**                          |   |
|                                                                                                              |   | **(Unaudited)**                |       | **(Audited)**                     |   |
|                                                                                                              |   |                           |       |                              |   |   |   |
| **ASSETS**                                                                                                        |   |                           |       |                              |   |   |   |
| Current                  Assets:                                                                                  |   |                           |       |                              |   |   |   |
| Cash                  and cash equivalents                                                                   |   | $                              | 100        |                              | $      | 2,168,100 |   |
| Accounts                  receivable - affiliate                                                             |   |                           | 140,200    |                              |   | 50,918,800 |   |
| Hedge                  receivable short-term                                                                      |   |                           | 2,300      |                              |   | ― |   |
| Total                  current assets                                                                             |   |                           | 142,600    |                              |   | 53,086,900 |   |
|                                                                                                              |   |                           |       |                              |   |   |   |
| Oil                  and gas properties, well drilling contracts and leases (successful                  efforts) |   |                           | 65,839,400 |                              |   | 1,829,900 |   |
| Less                  accumulated depletion                                                                       |   |                           | (58,000    | )                                 |   | ― |   |
|                                                                                                              |   |                           | 65,781,400 |                              |   | 1,829,900 |   |
|                                                                                                              |   |                           |       |                              |   |   |   |
| Hedge                  receivable long-term                                                                  |   |                           | 1,300      |                              |   | ― |   |
|                                                                                                              |   | $                              | 65,925,300 |                              | $      | 54,916,800 |   |
| **LIABILITIES                  AND PARTNERS’ CAPITAL**                                                      |   |                           |       |                              |   |   |   |
| Current                  liabilities:                                                                             |   |                           |       |                              |   |   |   |
| Accrued                  liabilities                                                                         |   | $                              | 19,000     |                              | $      | 13,200 |   |
| Accounts                  payable-affiliate                                                                       |   |                           | ―    |                              |   | 2,168,000 |   |
| Total                  current liabilities                                                                        |   |                           | 19,000     |                              |   | 2,181,200 |   |
|                                                                                                              |   |                           |       |                              |   |   |   |
| Asset                  retirement obligation                                                                 |   |                           | 137,900    |                              |   | 135,900 |   |
| Hedge                  liability long-term                                                                   |   |                           | 4,200      |                              |   | ― |   |
|                                                                                                              |   |                           |       |                              |   |   |   |
|                                                                                                              |   |                           |       |                              |   |   |   |
| Partners’                  capital:                                                                         |   |                           |       |                              |   |   |   |
| Managing                  general partner                                                                         |   |                           | 13,489,100 |                              |   | 362,400 |   |
| Investor                  partners (5,227.40 units)                                                               |   |                           | 52,275,700 |                              |   | 52,237,300 |   |
| Accumulated                  comprehensive loss                                                                   |   |                           | (600       | )                                 |   | ― |   |
|                                                                                                              |   |                           | 65,764,200 |                              |   | 52,599,700 |   |
|                                                                                                              |   | $                              | 65,925,300 |                              | $      | 54,916,800 |   |

** **

----

**ATLAS        AMERICA PUBLIC #15-2005 (A) L.P.**

**(A        Delaware Limited Partnership)**

**STATEMENT        OF OPERATIONS**

**(Unaudited)**

|                                                            |   | **Three                  Months Ended** |    |
|-----------------------------------------------------------------|--------|-----------------------------------------|---------|
|                                                            |   | **March                  31,**          |    |
|                                                            |   | **2006**                                |    |
|                                                            |   |                                    |    |
| **REVENUES:**                                                   |   |                                    |    |   |
| Natural                  gas and oil sales                 |   | $                                       | 174,200 |   |
| Total                  revenues                                 |   |                                    | 174,200 |   |
|                                                            |   |                                    |    |   |
| **COSTS                  AND EXPENSES:**                        |   |                                    |    |   |
| Production                  expenses                       |   |                                    | 26,900  |   |
| Depletion                  of oil and gas properties       |   |                                    | 58,000  |   |
| Accretion                  of asset retirement obligation  |   |                                    | 2,000   |   |
| General                  and administrative expenses       |   |                                    | 12,900  |   |
| Total                  expenses                                 |   |                                    | 99,800  |   |
| **Net                  earnings**                          |   | $                                       | 74,400  |   |
|                                                            |   |                                    |    |   |
|                                                            |   |                                    |    |   |
| **Allocation                  of net earnings:**                |   |                                    |    |   |
| Managing                  general partner                       |   | $                                       | 36,000  |   |
| Investor                  partners                              |   | $                                       | 38,400  |   |
| Net                  earnings per investor partnership unit     |   | $                                       | 7       |   |

----

**ATLAS        AMERICA PUBLIC #15-2005 (A) L.P.**

**(A        Delaware Limited Partnership)**

**STATEMENT        OF PARTNERS’ CAPITAL ACCOUNTS**

**FOR        THE THREE MONTHS ENDED **
**March        31, 2006**

**(Unaudited)**

|                                                         |   | **Managing** |       |         |   | **Accumulated**   |   |      |    |
|--------------------------------------------------------------|--------|--------------|------------|--------------|--------|-------------------|--------|-----------|---------|
|                                                         |   | **General**  |       | **Investor** |   | **Comprehensive** |   |      |    |
|                                                         |   | **Partner**  |       | **Partners** |   | **Loss**          |   | **Total** |    |
| **Balance                  at January 1, 2006**              |   | $            | 362,400    |         | $      | 52,237,300        |   | $         | ― |   | $ | 52,599,700 |   |
|                                                         |   |         |       |         |   |              |   |      |    |   |   |   |   |
| Participation                  in revenues and expenses:     |   |         |       |         |   |              |   |      |    |   |   |   |   |
| Net                  production revenues                     |   |         | 53,100     |         |   | 94,200            |   |      | ― |   |   | 147,300 |   |
| Accretion                  of asset retirement obligation    |   |         | (700       | )            |   | (1,300            | )      |      | ― |   |   | (2,000 | ) |
| Depletion                                                    |   |         | (11,800    | )            |   | (46,200           | )      |      | ― |   |   | (58,000 | ) |
| General                  and administrative costs            |   |         | (4,600     | )            |   | (8,300            | )      |      | ― |   |   | (12,900 | ) |
| Net                  earnings                                |   |         | 36,000     |         |   | 38,400            |   |      | ― |   |   | 74,400 |   |
|                                                         |   |         |       |         |   |              |   |      |    |   |   |   |   |
| Tangible                  and lease costs contributed by MGP |   |         | 13,090,700 |         |   | ―           |   |      | ― |   |   | 13,090,700 |   |
|                                                         |   |         |       |         |   |              |   |      |    |   |   |   |   |
| Other                  comprehensive loss                    |   |         | ―    |         |   | ―           |   |      | (600    | ) |   | (600 | ) |
|                                                         |   |         |       |         |   |              |   |      |    |   |   |   |   |
| **Balance                  at March 31, 2006**               |   | $            | 13,489,100 |         | $      | 52,275,700        |   | $         | (600    | ) | $ | 65,764,200 |   |

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**STATEMENT        OF CASH FLOWS**

**(Unaudited)**

|                                                                                                                  |   | **Three                  Months Ended** |        |
|-----------------------------------------------------------------------------------------------------------------------|--------|-----------------------------------------|-------------|
|                                                                                                                  |   | **March                  31,**          |        |
|                                                                                                                  |   | **2006**                                |        |
| **Cash                  flows from operating activities:**                                                            |   |                                    |        |   |
| Net                  earnings                                                                                         |   | $                                       | 74,400      |   |
| Adjustments                  to reconcile net earnings to net cash provided by operating                  activities: |   |                                    |        |   |
| Depletion                                                                                                             |   |                                    | 58,000      |   |
| Accretion                  of asset retirement obligation                                                             |   |                                    | 2,000       |   |
| Decrease                  in accounts receivable-affiliate                                                            |   |                                    | 50,778,600  |   |
| Decrease                  in accrued liabilities                                                                      |   |                                    | (2,162,200  | ) |
| Net                  cash provided by operating activities                                                            |   |                                    | 48,750,800  |   |
|                                                                                                                  |   |                                    |        |   |
| **Cash                  flows from investing activities:**                                                            |   |                                    |        |   |
| Oil                  and gas well drilling contracts paid to managing general                  partner                |   |                                    | (50,918,800 | ) |
| Net                  cash used in investing activities                                                                |   |                                    | (50,918,800 | ) |
|                                                                                                                  |   |                                    |        |   |
|                                                                                                                  |   |                                    |        |   |
| Net                  decrease in cash and cash equivalents                                                            |   |                                    | (2,168,000  | ) |
| Cash                  and cash equivalents at beginning of period                                                     |   |                                    | 2,168,100   |   |
| Cash                  and cash equivalents at end of period                                                           |   | $                                       | 100         |   |
|                                                                                                                  |   |                                    |        |   |
| **Supplemental                  schedule of non-cash investing and financing                  activities**:           |   |                                    |        |   |
|                                                                                                                  |   |                                    |        |   |
| Managing                  general partner asset contributions:                                                        |   |                                    |        |   |
| Tangible                  equipment/leasehold costs, included in oil and gas                  properties              |   | $                                       | 13,090,700  |   |

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS**

**March        31, 2006**

**(Unaudited)**

**NOTE        1 **
**-**
**        NATURE OF OPERATIONS**

**NOTE        2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES**

**Receivables**

**Revenue        Recognition**

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS (CONTINUED)**

**March        31, 2006**

**(Unaudited)**

**NOTE        2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)**

**Recently        Issued Financial Accounting Standards**

*Accounting        Changes and Error Corrections*

**Fair        Value of Financial Instruments**

**Asset        Retirement Obligation**

|                                                                |   | **Three                  Months** |    |
|---------------------------------------------------------------------|--------|-----------------------------------|---------|
|                                                                |   | **2006**                          |    |
| Asset                  retirement obligation at beginning of period |   | $                                 | 135,900 |   |
| Accretion                  expense                                  |   |                              | 2,000   |   |
| Total                  asset retirement obligation at end of period |   | $                                 | 137,900 |   |

**Supplemental        Cash Flow Information**

**Concentration        of **
**Credit        Risk**

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS (CONTINUED)**

**March        31, 2006**

**(Unaudited)**

**NOTE        2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)**

**Comprehensive        Income**

**Property        and Equipment**

| Oil                  and gas properties consist of the following: |   | **At                  March 31,** |       | **At                  December 31,** |   |
|-------------------------------------------------------------------|--------|-----------------------------------|------------|--------------------------------------|--------|
|                                                              |   | **2006**                          |       | **2005**                             |   |
| Capitalized                  costs of properties:                 |   |                              |       |                                 |   |   |   |
| Proved                  properties                                |   | $                                 | 1,540,200  |                                 | $      | 208,200 |   |
| Wells                  and related equipment                      |   |                              | 64,299,200 |                                 |   | 1,621,700 |   |
|                                                              |   |                              | 65,839,400 |                                 |   | 1,829,900 |   |
|                                                              |   |                              |       |                                 |   |   |   |
| Accumulated                  depletion                            |   |                              | (58,000    | )                                    |   | ― |   |
|                                                              |   | $                                 | 65,781,400 |                                 | $      | 1,829,900 |   |

**Oil        and Gas Properties**

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS (CONTINUED)**

**March        31, 2006**

**(Unaudited)**

**NOTE        2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES**
**        (CONTINUED)**

**Oil        and Gas Properties (Continued)**

**NOTE        3 **
**-**
**        TRANSACTIONS WITH ATLAS RESOURCES, LLC AND ITS AFFILIATES**

| ·   | Administrative                costs which are included in general and administrative costs in the                Statement of Operations are payable to Atlas at $75 per well per                month.                Administrative costs incurred for the three months ended March 31,                2006                were $2,400. |
|--------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ·   | Monthly                well supervision fees which are included in production expenses in                the                Statement of Operations are payable to Atlas at $285 per well per                month                for operating and maintaining the wells. Well supervision fees incurred                for the three months ended March 31, 2006 were                $9,000. |
|--------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ·   | Transportation                fees which are included in production expenses in the Statement of                Operations are payable to Atlas at rates ranging from $.29-$.35 per                mcf                (one thousand cubic feet) to 10% of natural gas revenue. Transportation                costs incurred for the three months ended March 31, 2006 were                $16,500. |
|--------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ·   | As                of March 31, 2006, the Partnership has funded $52,245,700 to Atlas                for                well drilling contracts, all of which has been spent to date on well                drilling cost. |
|--------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ·   | Tangible                and lease costs contributed by the managing general partner which                are                included within the supplemental schedule of non-cash activities                on the                Statement of Cash Flows for the three months ended March 31, 2006                were                $13,090,700. |
|--------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS (CONTINUED)**

**March        31, 2006**

**(Unaudited)**

**NOTE        3 **
**-**
**        TRANSACTIONS WITH ATLAS RESOURCES, LLC AND ITS AFFILIATES        (CONTINUED)**

**Subordination        of Managing General Partner’s Revenue Share**

**NOTE        4 - DERIVATIVE INSTRUMENTS**

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS (CONTINUED)**

**March        31, 2006**

**(Unaudited)**

**NOTE        4 - DERIVATIVE INSTRUMENTS (CONTINUED)**

| **Natural                  Gas Fixed - Price Swaps** |   |                             |   |                             |   |
|------------------------------------------------------|--------|----------------------------------|--------|----------------------------------|--------|
|                                                 |   |                             |   |                             |   |   |   |
| **Production**                                       |   |                             |   | **Average**                      |   | **Fair                  Value** |   |
| **Period**                                           |   | **Volumes**                      |   | **Fixed                  Price** |   | **Liability                  (2)** |   |
| **Ended                  March 31,**                 |   | **(MMBTU)                  (1)** |   | **(per                  MMBTU)** |   |   |   |
|                                                 |   |                             |   |                             |   |   |   |
| 2007                                                 |   |                             | 1,100  |                             | $      | 10.76 |   | $ | 2,300 |   |
| 2008                                                 |   |                             | 4,100  |                             |   | 8.76 |   |   | (3,100 | ) |
| 2009                                                 |   |                             | 3,400  |                             |   | 8.71 |   |   | (100 | ) |
| 2010                                                 |   |                             | 1,000  |                             |   | 8.35 |   |   | 300 |   |
|                                                 |   |                             |   |                             |   | Total                  liability  |   |   |   |   |
|                                                 |   |                             |   |                             |   |   |   | $ | (600 | ) |

| (1)   | MMBTU                represents million British Thermal Units. |
|-----------------|----------------------------------------------------------------|
| (2)   | Fair                value based on forward NYMEX natural gas prices, as                applicable. |
|-----------------|----------------------------------------------------------------------------------------------------|

|                                    |   | **March                  31, 2006** |   | **December                  31, 2005** |   |
|-----------------------------------------|--------|-------------------------------------|--------|----------------------------------------|--------|
|                                    |   | **Book                  Value**     |   | **Fair                  Value**        |   | **Book                  Value** |   | **Fair                  Value** |   |
| Assets                                  |   |                                |   |                                   |   |   |   |   |   |   |   |   |   |
| Derivative                  instruments |   | $                                   | 3,600  |                                   | $      | 3,600 |   | $ | ― |   | $ | ― |   |
|                                    |   | $                                   | 3,600  |                                   | $      | 3,600 |   | $ | ― |   | $ | ― |   |
| Liabilities                             |   |                                |   |                                   |   |   |   |   |   |   |   |   |   |
| Derivative                  instruments |   | $                                   | (4,200 | )                                      | $      | (4,200 | ) | $ | ― |   | $ | ― |   |
|                                    |   | $                                   | (600   | )                                      | $      | (600 | ) | $ | ― |   | $ | ― |   |

----

**ATLAS        AMERICA PUBLIC 15-2005(A) L.P.**

**(A        Delaware Limited Partnership)**

**NOTES        TO FINANCIAL STATEMENTS (CONTINUED)**

**March        31, 2006**

**(Unaudited)**

**NOTE        5 - COMPREHENSIVE INCOME**

|                                                                                                  |   | **Three                  Months Ended** |   |
|-------------------------------------------------------------------------------------------------------|--------|-----------------------------------------|--------|
|                                                                                                  |   | **March                  31,**          |   |
|                                                                                                  |   | **2006**                                |   |
|                                                                                                  |   |                                    |   |   |
| Net                  earnings                                                                         |   | $                                       | 74,400 |   |
| Other                  comprehensive income (loss):                                                   |   |                                    |   |   |
| Less:                  reclassification adjustment for (gain) realized in net                  income |   |                                    | (600   | ) |
| Comprehensive                  income                                                                 |   | $                                       | 73,800 |   |

| **ITEM                  2.** | **MANAGEMENT’S                  DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION OR PLAN OF OPERATIONS                  (UNAUDITED)** |
|------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------|

**Forward-Looking        Statements**

**General**

----

**Results        of Operations**

|                                                 |   | **Three                  Months** |    |
|------------------------------------------------------|--------|-----------------------------------|---------|
|                                                 |   | **Ended**                         |    |
|                                                 |   | **March                  31,**    |    |
|                                                 |   | **2006**                          |    |
| Production                  revenues (in thousands): |   |                              |    |   |
| Gas                  (1)                             |   | $                                 | 174     |   |
| Oil                                                  |   | $                                 | ― |   |
| Total                                                |   | $                                 | 174     |   |
|                                                 |   |                              |    |   |
| Production                  volumes:                 |   |                              |    |   |
| Gas                  (mcf/day) (1) (3)               |   |                              | 200     |   |
| Oil                  (bbls/day)                      |   |                              | ― |   |
| Total                  (mcfe/day) (3)                |   |                              | 200     |   |
|                                                 |   |                              |    |   |
| Average                  sales prices:               |   |                              |    |   |
| Gas                  (per mcf) (2) (3)               |   | $                                 | 9.42    |   |
| Oil                  (per bbl) (3)                   |   | $                                 | ― |   |
|                                                 |   |                              |    |   |
| Average                  production costs:           |   |                              |    |   |
| As                  a percent of sales               |   |                              | 15      | % |
| Per                  mcfe (3)                        |   | $                                 | 1.46    |   |
|                                                 |   |                              |    |   |
| Depletion                  per mcfe                  |   | $                                 | 3.15    |   |

| (1)   | Excludes                sales of residual gas and sales to                landowners. |
|-----------------|---------------------------------------------------------------------------------------|
| (2)   | The                average sales price per mcf before the effects of hedging was $9.39                for                the period ended March 31, 2006. There was no hedging in the period                ended                March 31, 2005. |
|-----------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| (3)   | “Mcf”                means thousand cubic feet, “mcfe” means thousand cubic feet equivalent and                “bbls” means barrels. Bbls are converted to mcfe using the ratio of six                mcfs to one bbl. |
|-----------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|

----

**Liquidity        and Capital Resources **

**Critical        Accounting Policies**

**Recently        Issued Financial Accounting Standards **

*Accounting        Changes and Error Corrections*

**ITEM        3. CONTROLS AND PROCEDURES**

**Evaluation        of Disclosure Controls and Procedures**

----

**PART        II.**
**OTHER        INFORMATION**

**ITEM        6. Exhibits**

**EXHIBIT        INDEX**

| **Exhibit                  No.** |   | **Description**                                                                                                                                                           |
|----------------------------------|--------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                             |   |                                                                                                                                                                      |
| 31.1                             |   | Certification                  Pursuant to Rule 13a-14/15(d)-14.                                                                                                          |
| 31.2                             |   | Certification                  Pursuant to Rule 13a-14/15(d)-14.                                                                                                          |
| 32.1                             |   | Certification                  Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section                  906 of                  the Sarbanes-Oxley Act of 2002 |
| 32.2                             |   | Certification                  Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section                  906 of                  the Sarbanes-Oxley Act of 2002 |

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**SIGNATURES**

| Pursuant                  to the requirements of the Securities Exchange Act of 1934, the                  registrant                  has duly caused this report to be signed on its behalf by the undersigned,                  thereunto duly authorized. |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|                                                                                                                                                                                                                                                          |   |   |
|                                                                                                                                                                                                                                                          |   |   |
| Atlas                  America Public #15-2005 (A) L.P.                                                                                                                                                                                                       |
|                                                                                                                                                                                                                                                          |   |   |
|                                                                                                                                                                                                                                                          |   | Atlas                  Resources, LLC, Managing General Partner |
|                                                                                                                                                                                                                                                          |   |   |
| Date:                  May 15, 2006                                                                                                                                                                                                                           |   | By:/s/                  Freddie M. Kotek |
|                                                                                                                                                                                                                                                          |   | Freddie                  M. Kotek, Chairman of the Board of Directors, Chief Executive                  Officer |
|                                                                                                                                                                                                                                                          |   | and                  President |
|                                                                                                                                                                                                                                                          |   |   |
|                                                                                                                                                                                                                                                          |   |   |
| In                  accordance with the Exchange Act, this report has been signed by                  the                  following persons on behalf of the registrant and in the capacities                  and on                  the dates indicated.  |
|                                                                                                                                                                                                                                                          |   |   |
|                                                                                                                                                                                                                                                          |   |   |
| Date:                  May 15, 2006                                                                                                                                                                                                                           |   | By:/s/                  Freddie M. Kotek |
|                                                                                                                                                                                                                                                          |   | Freddie                  M. Kotek, Chairman of the Board of Directors, Chief                  Executive |
|                                                                                                                                                                                                                                                          |   | Officer                  and President |
|                                                                                                                                                                                                                                                          |   |   |
|                                                                                                                                                                                                                                                          |   |   |
|                                                                                                                                                                                                                                                          |   |   |
| Date:                  May 15, 2006                                                                                                                                                                                                                           |   | By:/s/                  Nancy J. McGurk |
|                                                                                                                                                                                                                                                          |   | Nancy                  J. McGurk, Vice President, Chief Financial Officer and                  Chief |
|                                                                                                                                                                                                                                                          |   | Accounting                  Officer |
|                                                                                                                                                                                                                                                          |   |   |
|                                                                                                                                                                                                                                                          |   |   |

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