Andrew Earl Hassler (October 18, 1951 – December 25, 2019) was a Major League Baseball pitcher. He played for the California Angels (1971, 1973–1976 and 1980–1983), Kansas City Royals (1976–1978), Boston Red Sox (1978–1979), New York Mets (1979), Pittsburgh Pirates (1980) and St. Louis Cardinals (1984–1985).