John Thomas Keady (August 18, 1882 – February 12, 1964) was an American football, basketball, and baseball player and coach. He served as the head football coach at Lehigh University from 1912 to 1920, at the University of Vermont from 1921 to 1924, at Marine Corps Base Quantico from 1925 to 1930, and at Western Reserve University from 1931 to 1933, compiling a career college football record of 87–48–6. Keady was also the head basketball coach and the head baseball coach at Dartmouth College, Lehigh, Vermont, and Quantico.