Horace Maynard (August 30, 1814 – May 3, 1882) was an American educator, attorney, politician and diplomat active primarily in the second half of the 19th century. Initially elected to the House of Representatives from Tennessee's 2nd Congressional District for the term commencing on March 4, 1857, Maynard, an ardent Union supporter and later abolitionist, became one of the few Southern congressmen to maintain his seat in the House during the Civil War. Toward the end of the war, Maynard served as Tennessee's attorney general under Governor Andrew Johnson, and later served as ambassador to Turkey under President Ulysses S. Grant and Postmaster General under President Rutherford B. Hayes.