John Richard Barret (August 21, 1825 – November 2, 1903) was a slave owner and U.S. Representative from Missouri. Born in Greensburg, Kentucky, Barret attended the common schools and then went to Centre College in Danville, Kentucky. He moved to St. Louis, Missouri in 1839 and graduated from law school at Saint Louis University in 1843. He thereafter studied and then practiced law.