||November 20, 1941
Jeffrey ("Jeff") Mason Fishback (born November 20, 1941 in San Mateo, California) is a retired middle- and long-distance runner from the United States. He won the gold medal in the men's 3000 metres steeplechase event at the 1963 Pan American Games in Brazil.
Fishback represented his native country at the 1964 Summer Olympics in Tokyo, Japan. He was runner-up in the steeplechase at the 1962 NCAAs for San Jose State College coached by Lloyd (Bud) Winter. Fishback was affiliated with the Santa Clara Valley Youth Village .
- 2 miles – 8:50 (1962)
- Steeplechase – 8:40.4 (1964)
- 5,000 metres – 14:32.8 (1962)