| Stephanie Barna | |
| Office: | Acting United States Under Secretary of Defense for Personnel and Readiness |
| President: | Donald Trump |
| Term Start: | July 30, 2018 |
| Term End: | October 22, 2018 |
| Preceded: | Robert Wilkie |
| Succeeded: | James N. Stewart (acting) |
| Office1: | Acting Assistant Secretary of Defense for Manpower and Reserve Affairs |
| President1: | Donald Trump |
| Term Start1: | January 20, 2017 |
| Term End1: | October 22, 2018 |
| Preceded1: | Todd A. Weiler |
| Succeeded1: | James N. Stewart |
| Office2: | Acting Assistant Secretary of Defense for Readiness and Force Management |
| President2: | Barack Obama |
| Term Start2: | June 14, 2014 |
| Term End2: | April 2016 |
| Preceded2: | Frederick E. Vollrath |
| Succeeded2: | Dan Feehan (acting) |
| Birth Name: | Stephanie Anne Barna |
| Alma Mater: | Washington & Jefferson College University of Pittsburgh |
| Allegiance: |  United States |
| Branch: | United States Army |
| Rank: | Colonel |
| Serviceyears: | 1989–2011 |
| Mawards: | Legion of Merit Defense Meritorious Service Medal |
Stephanie Anne Barna is an American military officer, attorney, and civil servant. After Robert Wilkie's appointment as acting United States Secretary of Veterans Affairs by Donald Trump in 2018, Barna began performing the duties of Under Secretary of Defense for Personnel and Readiness.[1] She served as general counsel to the majority staff of the United States Senate Committee on Armed Services.[2]
Barna is a Fellow of the National Academy of Public Administration.