Arthur S. Mazmanian (May 1, 1927 – March 22, 2019) was an American baseball coach and manager. He was the longtime baseball coach at Dorsey High School of Los Angeles, his alma mater, then spent 31 seasons (1968–98) as head coach of baseball at Mount San Antonio College of Walnut, California, where his teams won 709 games and had only two losing campaigns. He also was a second baseman, scout, instructor and manager in professional baseball from 1949 through 1987. He died at the age of 91 on March 22, 2019.