Fitz Henry Warren (January 11, 1816 – June 1878) was a politician and a Union Army general during the American Civil War.

Upon the subsequent inauguration of President Taylor in 1849, Fitz Henry Warren was appointed First Assistant Postmaster General.

[1] After the death of Taylor, Warren resigned his position in protest of President Millard Fillmore's support of the Fugitive Slave Law.

In 1861 he was one of the chief editorial writers on the New York Tribune and the author of the controversial "On to Richmond" articles after the First Battle of Bull Run.

On February 21, 1866, President Andrew Johnson nominated Warren for appointment to the grade of brevet major general of volunteers, to rank from August 24, 1865, and the United States Senate confirmed the appointment on April 26, 1866.