Persifor Frazer Smith was an American military officer. He served as an officer in the Louisiana State militia and as Louisiana State adjutant general. He led two regiments of Louisiana and Pennsylvania volunteers during the Second Seminole War. He served as a colonel in the United States Army during the Mexican–American War, was brevetted to major general, and became known as the "hero of Contreras". He commanded the Pacific Division from 1848 to 1849 including as the 6th Military Governor of California from February to April 1849. He commanded the Department of Texas from 1850 to 1856 and the Department of the West from 1856 to 1858 during the Bleeding Kansas conflict. In 1858, he was appointed commander of the Department of Utah with orders to quell the Mormon Rebellion, but died at Fort Leavenworth before he could take command.