| Thomas Stilwell | |
| Ambassador From: | United States |
| Country: | Venezuela |
| President: | Andrew Johnson |
| Term Start: | December 16, 1867 |
| Term End: | June 7, 1868 |
| Predecessor: | James Wilson |
| Successor: | James R. Partridge |
| State2: | Indiana |
| Term Start2: | March 4, 1865 |
| Term End2: | March 3, 1867 |
| Predecessor2: | James F. McDowell |
| Successor2: | John P. C. Shanks |
| State House3: | Ohio |
| District3: | ? |
| Term Start3: | 1856 |
| Term End3: | 1856 |
| Birth Date: | 29 August 1830 |
| Birth Place: | Stillwell, Ohio, U.S. |
| Death Place: | Anderson, Indiana, U.S |
| Branch: | U.S. Army (Union Army) |
| Commands: | |
| Battles: | |
Thomas Neel Stilwell (August 29, 1830 – January 14, 1874) was an American lawyer, banker, and politician who served one term as a U.S. Representative from Indiana from 1865 to 1867.
Born in Stillwell, Ohio, he attended Oxford and College Hill Colleges, where he studied law.He was admitted to the bar in 1852 and began practice in Anderson, Indiana.
He served as member of the Ohio House of Representatives in 1856. He served in the 34th Indiana Infantry Regiment of the Union Army during the Civil War as a 1st Lieutenant and Regimental Quartermaster.
Stilwell was elected as a Republican to the Thirty-ninth Congress (March 4, 1865 – March 3, 1867).
He acted as Minister Resident to Venezuela in 1867 and 1868.He served as president of the First National Bank of Anderson, Indiana, until his death.
He died in Anderson as the result of a gunshot wound January 14, 1874.He was interred in Maplewood Cemetery.