| Gary Tredrea | |
| Fullname: | Gary Tredrea |
| Birth Date: | 1951 10, df=yes |
| Birth Place: | Victoria |
| Originalteam: | Reservoir |
| Height: | 175 cm |
| Weight: | 73 kg |
| Position: | Half forward flank, midfielder |
| Club1: | Collingwood (VFL) |
| Years1: | 1970–1972 |
| Games Goals1: | 19 (6) |
| Club2: | Port Adelaide (SANFL) |
| Years2: | 1973–76, 1978–79 |
| Games Goals2: | 65 (56) |
| Club3: | West Adelaide (SANFL) |
| Years3: | 1977 |
| Games Goals3: | 6 (2) |
| Games Goalstotal: | 90 (64) |
| Statsend: | 1972 |
Gary Tredrea (born 6 October 1951) is a former Australian rules footballer and current assistant coach of Port Adelaide in the SANFL. He is the father of Port Adelaide Power champion, Warren Tredrea.
Originally from Reservoir, the half forward flanker played 19 games and kicked 6 goals for Collingwood between 1970 and 1972.
He was going to move to Queensland but instead moved to South Australia where he played for the Port Adelaide Magpies in the SANFL. He made his SANFL debut in the 1973 season, playing approximately 70 games with Port and West Adelaide before his premature retirement due to a knee injury.
Tredrea has been a fixture with both the SANFL and AFL arms of the Port Adelaide Football Club since his playing retirement, coaching junior and reserves grades before returning to the Magpies as assistant coach to Tim Ginever for season 2008.
Tredrea currently lives in Port Adelaide.