| Thomas Ritchey | |
| State: | Ohio |
| Term Start: | March 4, 1847 |
| Term End: | March 3, 1849 |
| Preceded: | Isaac Parrish |
| Succeeded: | William A. Whittlesey |
| Term Start2: | March 4, 1853 |
| Term End2: | March 3, 1855 |
| Preceded2: | George H. Busby |
| Succeeded2: | Valentine B. Horton |
| Party: | Democratic |
| Birth Date: | 19 January 1801 |
| Birth Place: | Bedford County, Pennsylvania, US |
| Death Place: | Somerset, Ohio, US |
| Restingplace: | Zion Methodist Episcopal Cemetery |
Thomas Ritchey (January 19, 1801 – March 9, 1863) was an American politician who served two non-consecutive terms as a U.S. Representative from Ohio in the mid-19th century.
Born in Bedford County, Pennsylvania, Ritchey moved to Somerset, Ohio.He attended the common schools.He engaged in agricultural pursuits.Treasurer of Perry County in 1835, 1837, and 1839.
Ritchey was elected as a Democrat to the Thirtieth Congress (March 4, 1847 – March 3, 1849).
Ritchey was elected to the Thirty-third Congress (March 4, 1853 – March 3, 1855).
He engaged in agricultural pursuits near Somerset, Ohio, until his death on March 9, 1863.He was interred in the Zion Methodist Episcopal Cemetery, Madison Township, Perry County, Ohio.