William Michael Duffy (November 24, 1888 – May 17, 1953) was an American football player and coach.
He served as the head football coach at the University of Louisville from 1915 to 1916, compiling a record of 3–8–2.
[1] Duffy died of a heart attack on May 17, 1953, while making a speech at St. Bartholomew Church in Buechel, Louisville.
[2] # denotes interim/acting head coach