Pierce Manning Butler Young (November 15, 1836 – July 6, 1896) was an American soldier, politician, diplomat, and slave owner. He was a major general in the Confederate States Army during the American Civil War, and after the war a four-term United States Congressman from Georgia, before serving in the diplomatic corps.
 Young was born at Spartanburg, South Carolina on November 15, 1836. His father, Dr. R. M. Young, was a son of Capt. William Young, a soldier in the American Revolution under George Washington. When Pierce was a small boy, his father moved to Bartow County, Georgia, and enlisted private tutors for his children. At the age of thirteen, Young entered the Georgia Military Institute in Marietta, and graduated in 1856. He subsequently briefly studied law. In 1857, he was appointed to the United States Military Academy but resigned only two months before graduation due to Georgia's secession.
 Returning home in early 1861, he was appointed second lieutenant in the 1st Georgia Infantry regiment, but declined that commission for the same rank in the artillery. In July, he was promoted to first lieutenant and was attached to the staff of General Braxton Bragg at Pensacola, Florida.  He was at the same time aide-de-camp to Gen. W. H. T. Walker. In July, Young was appointed adjutant of the Georgia Legion, better known as Cobb's Legion, and was promoted to major in September and to lieutenant colonel in November, commanding the cavalry portion of the legion.
 Young's cavalry was attached to Wade Hampton's brigade of J.E.B. Stuart's cavalry division in the Army of Northern Virginia in 1862. He was distinguished for "remarkable gallantry," as Stuart expressed it, in the Maryland Campaign. Promoted to colonel, he rendered brilliant service at the Battle of Brandy Station and participated in the cavalry operations of the Gettysburg Campaign. In early August, he was wounded in another fight near Brandy Station. In October, he was promoted to brigadier general and assigned command of Hampton's old brigade, consisting of the 1st and 2nd South Carolina cavalry regiments, the Cobb Legion, Jeff Davis Legion and Phillips' Legion. He was actively engaged during the Bristoe and Mine Run Campaigns, where on October 12, 1863, by adroit maneuvering, he compelled an enemy division to recross the Rappahannock River. An admiring Stuart reported, "The defeat of an expedition which might have proved so embarrassing entitles the officers who effected it to the award of distinguished skill and generalship."
 In 1864, Young played a prominent part in the Overland Campaign in Virginia, and when Hampton assumed command of the cavalry after Stuart's death at Yellow Tavern, he temporarily took Hampton's place as division commander. In November, Young was sent to Augusta to gather reinforcements and aid in the defense of that city, threatened by William T. Sherman. Promoted to major general in December, he was actively engaged in the defense of Savannah and the 1865 campaign in the Carolinas under General Hampton until the close of the war.
 After the war, he returned to Georgia and lived as a planter. He was elected to the US House of Representatives, as a Democrat for four terms (1868-1875). Young ran for a fifth term, but was defeated by the Grange-backed candidate William Harrell Felton. Young was appointed United States commissioner to the Paris Exposition in 1878. He served as consul-general at St. Petersburg, Russia (1885–87) and as Envoy Extraordinary and Minister Plenipotentiary to Guatemala and Honduras (1893-1896) by appointment of President Grover Cleveland.  Young died on July 6, 1896, in New York City, with interment in Oak Hill Cemetery, Cartersville, Georgia