Thomas Francis Magner (March 8, 1860 – December 22, 1945) was an American lawyer and politician who served three terms as a U.S. Representative from New York from 1889 to 1895.

Born in Brooklyn, New York, Magner attended the public schools.

He graduated from St. Xavier College in 1880 and from Columbia University, New York City, in 1882.

He resumed the practice of law, and served as corporation counsel of the Borough of Brooklyn from 1913 to 1917.

He died, after a long illness, in the Hotel Bossert, Brooklyn, New York on December 22, 1945.