Lloyd Mangrum (born 1 August 1914 in Trenton, Texas, died 17 November 1973) was an American golfer. A Texan, he was known for and smooth swing and his relaxed demeanour on the course.
Mangrum became a professional golfer at fifteen, working as an assistant to his brother Ray, the head professional at Cliff-Dale Country Club in Dallas. He joined the PGA Tour in 1937 and went on to win thirty-six events on the Tour. He might have won more if his career had not been interrupted by service in World War II. While training for the D-Day landings, Mangrum was offered the professional's job at the army's Fort Meade golf course, which would have kept him out of combat, but he declined. He won two Purple Hearts and was wounded in the Battle of the Bulge. His best years on tour came after the war. He led the PGA Tour money list in 1951 and won the Vardon Trophy for the lowest scoring average on the tour in 1951 and 1953.
Mangrum's only major championship win came at the 1946 U.S. Open, though he was runner-up in four further majors and third in five more. He lost playoffs for the 1946 and 1950 U.S. Opens. In 1940 he shot a tournament record 64 in the opening round of The Masters Tournament, a record that stood for several decades until Nick Price shot a 63.