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|--------|
|        |
|   |

|        |
|--------|
|        |
|   |

|        |
|--------|
|        |  |
|   | Annual Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 |

|        |
|--------|
|        |  |
|   | Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 |

|                        |
|------------------------|
|                        |  |  |
| Commission file number |   | 001-32336 (Digital Realty Trust, Inc.) |
|                   |   | 000-54023 (Digital Realty Trust, L.P.) |

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|--------|
|        |
|   |

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|        |
|   |

|                                                                            |
|----------------------------------------------------------------------------|
|                                                                            |  |
| Maryland (Digital Realty Trust, Inc.)Maryland (Digital Realty Trust, L.P.) | 26-008171120-2402955 |
| (State or other jurisdiction of incorporation or organization)             | (IRS employer identification number) |
| Four Embarcadero Center, Suite 3200San Francisco, CA                       | 94111 |
| (Address of principal executive offices)                                   | (Zip Code) |

|        |
|--------|
|        |
|   |

|                            |
|----------------------------|
|                            |  |  |
|                       | Title of each class | Name of each exchange on which registered |
| Digital Realty Trust, Inc. | Common stock, $0.01 par value per share | New York Stock Exchange |
|                       | Series E cumulative redeemable preferredstock, $0.01 par value per share | New York Stock Exchange |
|                       | Series F cumulative redeemable preferredstock, $0.01 par value per share | New York Stock Exchange |
|                       | Series G cumulative redeemable preferredstock, $0.01 par value per share | New York Stock Exchange |
|                       | Series H cumulative redeemable preferredstock, $0.01 par value per share | New York Stock Exchange |
|                       | Series I cumulative redeemable preferredstock, $0.01 par value per share | New York Stock Exchange |
| Digital Realty Trust, L.P. | None | None |

|        |
|--------|
|        |
|   |

|                                           |
|-------------------------------------------|
|                                           |  |  |
| Digital Realty Trust, Inc. |   | None |
| Digital Realty Trust, L.P. |   | Common Units ofPartnership Interest |

|                            |
|----------------------------|
|                            |  |
| Digital Realty Trust, Inc. | Yes x    No o   |
| Digital Realty Trust, L.P. | Yes o   No x   |

|                            |
|----------------------------|
|                            |  |
| Digital Realty Trust, Inc. | Yes o  No x   |
| Digital Realty Trust, L.P. | Yes o No x  |

|                            |
|----------------------------|
|                            |  |
| Digital Realty Trust, Inc. | Yes  x    No o   |
| Digital Realty Trust, L.P. | Yes  x    No o   |

|                            |
|----------------------------|
|                            |  |
| Digital Realty Trust, Inc. | Yes x    No o   |
| Digital Realty Trust, L.P. | Yes  x    No o   |

|                                   |
|-----------------------------------|
|                                   |  |  |  |
| Large accelerated filer | x | Accelerated filer | o |
| Non-accelerated filer             | o (Do not check if a smaller reporting company) | Smaller reporting company | o |

|                                   |
|-----------------------------------|
|                                   |  |  |  |
| Large accelerated filer | o | Accelerated filer | o |
| Non-accelerated filer             |  x (Do not check if a smaller reporting company) | Smaller reporting company | o |

|                            |
|----------------------------|
|                            |  |
| Digital Realty Trust, Inc. | Yes o  No x  |
| Digital Realty Trust, L.P. | Yes o  No x   |

|                                        |
|----------------------------------------|
|                                        |  |  |
| Class                                  | Outstanding at March 31, 2016 |
| Common Stock, $.01 par value per share | 146,797,648 |   |

----

----

|               |
|---------------|
|               |  |  |
| ExhibitNumber |   | Description |
|          |   |
|          |   |   |
| 21.1          |   | List of Subsidiaries of Digital Realty Trust, Inc. |
|          |   |   |
| 21.2          |   | List of Subsidiaries of Digital Realty Trust, L.P. |
|          |   |   |
|          |   |
| 31.1          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Executive Officer for Digital Realty Trust, Inc. |
|          |   |
| 31.2          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Financial Officer for Digital Realty Trust, Inc. |
|          |   |
| 31.3          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Executive Officer for Digital Realty Trust, L.P. |
|          |   |
| 31.4          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Financial Officer for Digital Realty Trust, L.P. |
|          |   |   |
| 32.1          |   | 18 U.S.C. § 1350 Certifications of Chief Executive Officer for Digital Realty Trust, Inc. |
|          |   |
| 32.2          |   | 18 U.S.C. § 1350 Certifications of Chief Financial Officer for Digital Realty Trust, Inc. |
|          |   |
| 32.3          |   | 18 U.S.C. § 1350 Certifications of Chief Executive Officer for Digital Realty Trust, L.P. |
|          |   |   |
| 32.4          |   | 18 U.S.C. § 1350 Certifications of Chief Financial Officer for Digital Realty Trust, L.P. |

----

|                                      |
|--------------------------------------|
|                                      |  |  |
| DIGITAL REALTY TRUST, INC. |
|                                 |   |
| By:                                  |   | /s/    Joshua A. Mills |
|                                 |   | Joshua A. MillsSenior Vice President, General Counsel and Secretary |
|                                 |
| Date: April 1, 2016                  |

|                     |
|---------------------|
|                     |  |  |  |  |
| Signature           |   | Date |
|                |   |   |
|   *       |   | Chairman of the Board |   | April 1, 2016 |
| Dennis E. Singleton |   |   |   |   |
|                |   |   |
| *                   |   | Chief Executive Officer and Director(Principal Executive Officer) |   | April 1, 2016 |
| A. William Stein    |   |   |   |   |
|                |   |   |   |   |
| *                   |   | Chief Financial Officer(Principal Financial Officer) |   | April 1, 2016 |
| Andrew P. Power     |   |   |
|                |   |   |   |   |
| *                   |   | Sr. Vice President and Controller (Principal Accounting Officer) |   | April 1, 2016 |
| Edward F. Sham      |   |   |

|                          |
|--------------------------|
|                          |  |  |  |  |
| *                        |   | Director |   | April 1, 2016 |
| Laurence A. Chapman      |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| Kathleen Earley          |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| Kevin J. Kennedy         |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| William G. LaPerch       |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| Robert H. Zerbst         |   |   |   |   |
|                     |   |   |   |   |
| *By: /s/ Joshua A. Mills |   |   |   | April 1, 2016 |
| Attorney in Fact         |   |   |   |   |

----

|                                      |
|--------------------------------------|
|                                      |  |  |
| DIGITAL REALTY TRUST, L.P. |
|                                 |   |
| By:                                  |   | Digital Realty Trust, Inc.,Its General Partner |
|                                 |   |
| By:                                  |   | /s/    Joshua A. Mills |
|                                 |   | Joshua A. MillsSenior Vice President, General Counsel and Secretary |
|                                 |
| Date: April 1, 2016                  |

|                     |
|---------------------|
|                     |  |  |  |  |
|                |   |   |
| Signature           |   | Title |   | Date |
|                |   |   |
|   *       |   | Chairman of the Board |   | April 1, 2016 |
| Dennis E. Singleton |   |   |   |   |
|                |   |   |   |   |
| *                   |   | Chief Executive Officer and Director(Principal Executive Officer) |   | April 1, 2016 |
| A. William Stein    |   |   |   |   |
|                |   |   |   |   |
| *                   |   | Chief Financial Officer(Principal Financial Officer) |   | April 1, 2016 |
| Andrew P. Power     |   |   |
|                |   |   |   |   |
| *                   |   | Sr. Vice President and Controller (Principal Accounting Officer) |   | April 1, 2016 |
| Edward F. Sham      |   |   |

|                          |
|--------------------------|
|                          |  |  |  |  |
| *                        |   | Director |   | April 1, 2016 |
| Laurence A. Chapman      |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| Kathleen Earley          |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| Kevin J. Kennedy         |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| William G. LaPerch       |   |   |
|                     |   |   |   |   |
| *                        |   | Director |   | April 1, 2016 |
| Robert H. Zerbst         |   |   |   |   |
|                     |   |   |   |   |
| *By: /s/ Joshua A. Mills |   |   |   | April 1, 2016 |
| Attorney in Fact         |   |   |   |   |

----

|               |
|---------------|
|               |  |  |
| ExhibitNumber |   | Description |
|          |   |
|          |   |   |
| 21.1          |   | List of Subsidiaries of Digital Realty Trust, Inc. |
|          |   |   |
| 21.2          |   | List of Subsidiaries of Digital Realty Trust, L.P. |
|          |   |   |
|          |   |
| 31.1          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Executive Officer for Digital Realty Trust, Inc. |
|          |   |
| 31.2          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Financial Officer for Digital Realty Trust, Inc. |
|          |   |
| 31.3          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Executive Officer for Digital Realty Trust, L.P. |
|          |   |
| 31.4          |   | Rule 13a-14(a)/15d-14(a) Certifications of Chief Financial Officer for Digital Realty Trust, L.P. |
|          |   |   |
| 32.1          |   | 18 U.S.C. § 1350 Certifications of Chief Executive Officer for Digital Realty Trust, Inc. |
|          |   |
| 32.2          |   | 18 U.S.C. § 1350 Certifications of Chief Financial Officer for Digital Realty Trust, Inc. |
|          |   |
| 32.3          |   | 18 U.S.C. § 1350 Certifications of Chief Executive Officer for Digital Realty Trust, L.P. |
|          |   |   |
| 32.4          |   | 18 U.S.C. § 1350 Certifications of Chief Financial Officer for Digital Realty Trust, L.P. |