| Onslow Humphreys | |
| Birth Name: | Oliver W. Humphreys[1] |
| Birth Date: | c. 1893 |
| Birth Place: | Sydney |
| Ru Position: | fly-half |
| Repyears1: | 1920–25 |
| Repteam1: | Wallabies |
| Repcaps1: | 6 |
| Reppoints1: | 3 |
Oliver W. "Onslow" Humphreys (born c. 1893) was a rugby union player who represented Australia.
Humphreys, a fly-half, was born in Sydney and claimed a total of 6 international rugby caps for Australia.