Timothy Michael Tierney (October 3, 1943 – September 15, 2012) was an American football player and coach. He served as the head football coach at California State University, Hayward—now known as California State University, East Bay—from 1975 to 1993, compiling a record of 77–109–5. Tierney was born on October 3, 1943, in Buffalo, New York, and grew up in San Francisco, where he graduated from St. Ignatius High School—now known as St. Ignatius College Preparatory. He played college football as San Francisco State University, earning All-Far Western Conference honors twice as a defensive back.