Mushy Callahan (November 3, 1904 – June 18, 1986) was the ring name of Vincent Morris Scheer, a Los Angeles-based boxing champion in the newly created World Light Welterweight Division for five years from 1926 to 1930. The championship was formerly referred to as the World SuperLightweight Title. After his retirement from boxing in 1932, Callahan refereed hundreds of matches, and had a thirty-year career taking small roles in movies, most with boxing themes, as well as working as a stuntman and boxing adviser on movie sets.