Alexander Spinning Lilley (December 7, 1867 – December 8, 1925) was an American football coach. He served as the first head football coach at Ohio State University, coaching from 1890 to 1891, and compiling a record of 3–5. Lilley was an unpaid volunteer coach during his time coaching at Ohio State. He was also known to ride an Indian pony to practices during his tenure. A plaque at the Ohio State football stadium memorializes him as "A Lone and Ardent Volunteer".
He died after a five-month illness in 1925. At the time of his death he was a manager for a shipbuilding company in New York.