Andrew Earl Hassler
- Bats Left, Throws Left
- Height 6' 5", Weight 220 lb.
- High School Palo Verde High School (Tucson)
- Debut May 30, 1971
- Final Game May 7, 1985
- Born October 18, 1951 in Texas City, TX USA
Andy Hassler had a particularly unlucky season in 1974 with the California Angels, during which he held a 2.61 ERA over 22 starts (a 131 ERA+), which included 10 complete games, yet finished the season with only 7 wins against 11 losses. He was purchased by the Kansas City Royals midway through the 1976 season and had better results with his new team over the remainder of that year and in 1977. He started a game in the ALCS both years against the New York Yankees, but lost both times. He then had a long career as a reliever after moving to the bullpen full-time in 1980 while back with the Angels.