| Jock Blackwood | |
| Birth Name: | John Garven Blackwood[1] |
| Birth Date: | 26 August 1899 |
| Birth Place: | Mona Vale, New South Wales |
| Death Date: | c. 1979 |
| Ru Position: | hooker |
| Amatteam1: | Eastern Suburbs RUFC |
| Repyears1: | 1922–28 |
| Repteam1: | Wallabies |
| Repcaps1: | 21 |
| Reppoints1: | 0 |
John Garven Blackwood (26 August 1899 – c. 1979) was a rugby union player who represented Australia.
Blackwood, a hooker, was born in Mona Vale, New South Wales and claimed a total of 21 international rugby caps for Australia. He was inducted into the Australian Rugby Union's Hall of Fame in 2015.