John Llewellyn Fenlon (December 7, 1909 – September 2, 2000) was an American football coach. He served as the head football coach at the University of Richmond in 1942 and again from 1946 to 1947, compiling a record of 12–15–3. Fenlon attended George Washington University, where he lettered in football, basketball, and baseball in the early 1930s. He died on September 2, 2000.