Andrew Gregg Curtin (1817–1894) was a U.S. lawyer and politician. He served as the 15th Governor of Pennsylvania during the American Civil War. During the Civil War, Curtin organized the Pennsylvania reserves into combat units, and oversaw the construction of the first Union military camp for training militia. After the Battle of Gettysburg, Governor Curtin was the principal force behind the establishment of the National Cemetery there. After serving two terms as governor, Curtin was appointed ambassador to Russia by Ulysses S. Grant, and he later served in the House of Representatives from 1881 until 1887.