Thomas Clarke Theaker
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	(1812-02-04)February 4, 1812 York, Pennsylvania, US
Died	July 16, 1883(1883-07-16) (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.

Theaker was a native of York, Pennsylvania, but moved to Bridgeport, Ohio, in 1830, where he became a wheelwright and machinist.

Elected as a Republican to represent the Seventeenth Congressional District of Ohio in the Thirty-Sixth Congress, he failed to win re-election in 1860, but was appointed to a seat on the U.S. Patent Office's Board of Appeals.

On August 15, 1865, he was appointed commissioner of the Patent Office, a post he held until his resignation in January 1868.

• United States Congress. "Thomas Clarke Theaker (id: T000151)". Biographical Directory of the United States Congress.