Walter Lisle "Ty" Krentler (April 23, 1895 - November 30, 1971), sometimes shown as Walter Lyle Krentler, was an American football player. He played at the fullback position for the 1920 Detroit Heralds during the first regular season of the NFL (then known as the American Professional Football Association). He also played college football for the University of Detroit in 1918 and 1919 and professional football for the Detroit Maroons in 1921.