Walter Frederic "Mike" Kelly (January 13, 1874 – March 1, 1961) was an American football player, coach of football, basketball, and baseball, and physician. He served as the head football coach at University of Texas at Austin in 1897 and at Butler University from 1899 to 1903, compiling a career college football record of 10–14. Kelly was also the head basketball coach at Butler from 1899 to 1903, tallying a mark of 6–8, and was the school's head baseball coach from 1901 to 1905 and again in 1908, amassing a record of 7–21–1. Before his tenure at Butler, Kelly served as an assistant coach to David Farragut Edwards at Texas in 1898.