Louis William Daddio (April 26, 1916 – July 5, 1989) was an American football player, coach, and scout. He was an All-American at end at the University of Pittsburgh and played with the Chicago Cardinals of the National Football League (NFL) from 1941 to 1942 and the Buffalo Bisons of the All-America Football Conference (AAFC) in 1946. Daddio served as the head football coach at Allegheny College from 1947 to 1951, compiling a record of 14–18–5. He was later an assistant football coach at Purdue University and the University of Notre Dame and a personnel director for the Philadelphia Eagles. From 1969 until his retirement in 1987, he worked as a scout for the Denver Broncos.