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

| DELAWARE                                       |   | 04-348039204-348039254-1843973        |
|------------------------------------------------|--------|---------------------------------------|
| (State or other Jurisdiction of Incorporation) |   | (I.R.S. Employer Identification Nos.) |

| Large accelerated filer | ☐ |  |                                               |  | Accelerated filer         | ☐ |
|-------------------------|---------|--|-----------------------------------------------|--|---------------------------|---------|
| Non-accelerated filer   | ☑ |  | (Do not check if a smaller reporting company) |  | Smaller reporting company | ☐ |
|                         |         |  |                                               |  | Emerging growth company   | ☐ |

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| Item 1. | Business |
|---------|----------|

| Item 1A. | Risk Factors |
|----------|--------------|

| Item 2. | Properties |
|---------|------------|

| Item 3. | Legal Proceedings |
|---------|-------------------|

| Item 1B. | Unresolved Staff Comments |
|----------|---------------------------|

| Item 4. | Mine Safety Disclosures. |
|---------|--------------------------|

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| Item 5. | Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities |
|---------|--------------------------------------------------------------------------------------------------------------------|

| Item 6. | Selected Financial Data |
|---------|-------------------------|

| Item 7. | Management’s Discussion and Analysis of Financial Condition and Results of Operation |
|---------|--------------------------------------------------------------------------------------------|

| Item 7A. | Quantitative and Qualitative Disclosures about Market Risk |
|----------|------------------------------------------------------------|

| Item 8. | Financial Statements and Supplementary Data |
|---------|---------------------------------------------|

| Item 9. | Changes in and Disagreements with Accountants on Accounting and Financial Disclosure |
|---------|--------------------------------------------------------------------------------------|

| Item 9A. | Controls and Procedures |
|----------|-------------------------|

| Item 9B. | Other Information |
|----------|-------------------|

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| Item 10. | Directors, Executive Officers, and Corporate Governance |
|----------|---------------------------------------------------------|

| Item 11. | Executive Compensation |
|----------|------------------------|

| Item 12. | Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters |
|----------|------------------------------------------------------------------------------------------------|

| Item 13. | Certain Relationships, Related Transactions, and Director Independence |
|----------|------------------------------------------------------------------------|

| Item 14. | Principal Accountant Fees and Services |
|----------|----------------------------------------|

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| Item 15. | Exhibits and Financial Statement Schedules |
|----------|--------------------------------------------|

|  | (a) | List of Documents Filed as Part of this Annual Report on Form 10-K |
|--|-----|--------------------------------------------------------------------|

|  | (1) | Not applicable. |
|--|-----|-----------------|

|  | (2) | Not applicable. |
|--|-----|-----------------|

|  | (3) | See Item 15 (b) below. |
|--|-----|------------------------|

|  | (b) | Exhibits Required by Item 601 of Regulation S-K |
|--|-----|-------------------------------------------------|

| EXHIBIT |   | DESCRIPTION                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 4.1     |   | Indenture dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, and Wells Fargo Bank, N.A., as eligible lender trustee, which is incorporated by reference from Exhibit 4.6 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11.                                                                                                                                                   |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 10.1    |   | Indenture dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, and Wells Fargo Bank, N.A., as eligible lender trustee, which is incorporated by reference from Exhibit 4.6 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11.                                                                                                                                                   |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 10.2    |   | Servicing Agreement dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, Wells Fargo Bank, N.A., as eligible lender trustee, and Navient Solutions, LLC (formerly, Navient Solutions, Inc.)., as servicer and as administrator, which is incorporated by reference from Exhibit 99.7 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11.                                         |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 10.3    |   | Administration Agreement dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, Wells Fargo Bank, N.A., as eligible lender trustee, Navient Funding, LLC, as depositor, and Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as servicer and as administrator, which is incorporated by reference from Exhibit 99.6 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11. |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 31.1*   |   | Rule 13a-14(d)/15d-14(d) Certification. (Section 302 Certification).                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 33.1*   |   | Report on Assessment of Compliance with Servicing Criteria concerning servicing activities of Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as Servicer and Administrator, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                  |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 33.2*   |   | Report on Assessment of Compliance with Servicing Criteria concerning servicing activities of Wells Fargo Bank, N.A., as Indenture Trustee, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                               |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 34.1*   |   | Independent Accountants’ Attestation Report concerning servicing activities of Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as Servicer and Administrator, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                           |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 34.2*   |   | Independent Accountants’ Attestation Report concerning servicing activities of Wells Fargo Bank, N.A., as Indenture Trustee, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                                        |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| 35.1*   |   | Statement of Compliance of Navient Solutions, LLC (formerly, Navient Solutions, Inc.)., as Servicer and Administrator for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                                                               |
|    |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
|    |   | * Filed herewith.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |

|  | (c) | Not Applicable. |
|--|-----|-----------------|

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| Dated: March 30, 2018 | NAVIENT FUNDING, LLC,the Depositor for itself as Registrant and on behalf of Navient Student Loan Trust 2015-1 |
|-----------------------|----------------------------------------------------------------------------------------------------------------|
|                  |
| By:                   | /s/ CHRISTIAN LOWN                                                                                             |   |
| Name:                 | Christian Lown                                                                                                 |   |
|                  |                                                                                                           | Title: | President and Chief Financial Officer(Senior Securitization Officer) |

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| ExhibitNumber |   | Exhibit                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|---------------|--------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 4.1           |   | Indenture dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, and Wells Fargo Bank, N.A., as eligible lender trustee, which is incorporated by reference from Exhibit 4.6 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11.https://www.sec.gov/Archives/edgar/data/949114/000092963815000267/ex4-6.htm                                                                                                                                                    |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 10.1          |   | Indenture dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, and Wells Fargo Bank, N.A., as eligible lender trustee, which is incorporated by reference from Exhibit 4.6 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11.https://www.sec.gov/Archives/edgar/data/949114/000092963815000267/ex4-6.htm                                                                                                                                                    |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 10.2          |   | Servicing Agreement dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, Wells Fargo Bank, N.A., as eligible lender trustee, and Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as servicer and as administrator, which is incorporated by reference from Exhibit 99.7 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11.https://www.sec.gov/Archives/edgar/data/949114/000092963815000267/ex99-7.htm                                          |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 10.3          |   | Administration Agreement dated as of February 26, 2015 among Navient Student Loan Trust 2015-1, Wells Fargo Bank, N.A., as indenture trustee, Wells Fargo Bank, N.A., as eligible lender trustee, Navient Funding, LLC, as depositor, and Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as servicer and as administrator, which is incorporated by reference from Exhibit 99.6 of the Current Report on Form 8-K of the registrant, as filed with the Commission on February 26, 2015, with a file number of 333-190926-11.https://www.sec.gov/Archives/edgar/data/949114/000092963815000267/ex99-6.htm |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 31.1*         |   | Rule 13a-14(d)/15d-14(d) Certification. (Section 302 Certification).                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 33.1*         |   | Report on Assessment of Compliance with Servicing Criteria concerning servicing activities of Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as Servicer and Administrator, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                                                              |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 33.2*         |   | Report on Assessment of Compliance with Servicing Criteria concerning servicing activities of Wells Fargo Bank, N.A., as Indenture Trustee, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                                                                                                           |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 34.1*         |   | Independent Accountants’ Attestation Report concerning servicing activities of Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as Servicer and Administrator, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                                                                       |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 34.2*         |   | Independent Accountants’ Attestation Report concerning servicing activities of Wells Fargo Bank, N.A., as Indenture Trustee, as of and for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                                                                                                                    |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 35.1*         |   | Statement of Compliance of Navient Solutions, LLC (formerly, Navient Solutions, Inc.), as Servicer and Administrator for the year ended December 31, 2017.                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|          |   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|          |   | * Filed herewith.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |

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