| Gregory Hayman | |
| Nationality: | Australian |
| Sport: | Weightlifting |
| Birth Date: | 21 December 1957[1] |
Gregory Hayman (born 21 December 1957) is an Australian former weightlifter. He competed in the men's flyweight event at the 1988 Summer Olympics.[2]
He competed at the Commonwealth Games in 1986, where he won a gold medal in the men's flyweight event,[3] and in 1990, where he won a silver medal in the Clean and Jerk event and bronze medals in the overall and Snatch events.