Thomas Clarke Theaker | |
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| Member of the U.S. House of Representatives from Ohio's 17th district | |
| In office March 4, 1859 – March 3, 1861 | |
| Preceded by | William Lawrence |
| Succeeded by | James R. Morris |
| Commissioner of United States Patent Office | |
| In office August 17, 1865 – January 20, 1868 | |
| Appointed by | Andrew Johnson |
| Preceded by | David P. Holloway |
| Succeeded by | Elisha Foote |
| Personal details | |
| Born | February 4, 1812 York, Pennsylvania, US |
| Died | July 16, 1883 (aged 71) Oakland, Maryland, US |
| Resting place | Weeks Cemetery, Bridgeport, Ohio, US |
| Political party | Republican |
Thomas Clarke Theaker (February 4, 1812 – July 16, 1883) was an American politician who served one term as U.S. Congressman from 1859 to 1861. He also served as commissioner of the United States Patent Office from 1865 to 1868.