Thomas Clement Fletcher (January 21, 1827 – March 25, 1899) was the 18th Governor of Missouri during the latter stages of the American Civil War and the early part of Reconstruction.

Fletcher was a delegate to the 1860 Republican National Convention in Chicago, where he supported the nomination of Abraham Lincoln.

After the war, he became a companion of the Missouri Commandery of the Military Order of the Loyal Legion of the United States.

He served from 1865 to 1869, and on January 11, 1865, issued a "Proclamation of Freedom," adding his own imprimatur to the ordinance passed the same day by the state constitutional convention, abolishing slavery in Missouri.

He was unsuccessful, however, in his repeated efforts to obtain a constitutional amendment abolishing the test oath as a qualification for voting and for engaging in the professions.

He supported normal schools for training teachers, greater funding for the state university, and special attention to agricultural education.