| Under Secretary of Defense for Policy | |
|---|---|
 Seal of the Department of Defense | |
 Flag of an Under Secretary of Defense | |
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| United States Department of Defense Office of the Secretary of Defense | |
| Style | Madam Under Secretary |
| Reports to | Secretary of Defense Deputy Secretary of Defense |
| Appointer | The President with Senate advice and consent |
| Term length | No fixed term |
| Formation | 1978 |
| First holder | Stanley Rogers Resor |
| Succession | 5th in SecDef succession |
| Deputy | Principal Deputy Under Secretary of Defense for Policy |
| Salary | Executive Schedule, level III |
| Website | policy |
The United States under secretary of defense for policy (USDP) is a high level civilian official in the United States Department of Defense. The under secretary of defense for policy is the principal staff assistant and adviser to both the secretary of defense and the deputy secretary of defense for all matters concerning the formation of national security and defense policy.
The under secretary is normally appointed from civilian life by the president with the advice and consent of the Senate. The incumbent is acting under secretary Amanda J. Dory, who took office upon the resignation of acting under secretary Sasha Baker.