Lloyd R. Leith (December 7, 1902 – September 30, 1974) was an American basketball referee and high school coach. The San Francisco, California native officiated 16 NCAA Division I Men's Tournament Championships between 1939 and 1955. He also served as head coach at Balboa High School (1931-36), George Washington High School (1936-42) and Mission High School (1945-72).
Lloyd Leith was inducted into the Naismith Memorial Basketball Hall of Fame as a referee in 1983. He is also a member of the San Francisco Prep Hall of Fame.