| Alex McKinnon | |
| Birth Name: | Alexander McKinnon[1] |
| Birth Date: | 3 March 1878 |
| Birth Place: | Smeaton, Victoria |
| Death Date: | circa 1944 |
| Ru Position: | lock |
| Repyears1: | 1904 |
| Repteam1: | Australia |
| Repcaps1: | 1 |
| Reppoints1: | 0 |
Alexander McKinnon (3 March 1878 - c. 1944) was a rugby union player who represented Australia.
McKinnon, a lock, was born in Smeaton, Victoria and claimed one international rugby cap for Australia, playing against Great Britain, at Brisbane, on 23 July 1904.