| Alf Rainbow | |
| Birth Name: | Alfred Ernest Rainbow[1] |
| Birth Date: | 1 April 1900 |
| Birth Place: | London |
| Death Place: | Sydney |
| Ru Position: | fly-half |
| Repyears1: | 1925–25 |
| Repteam1: | Wallabies |
| Repcaps1: | 1 |
| Reppoints1: | 0 |
Alfred Ernest "Alf" Rainbow (1 April 1900 – 17 December 1963) was a rugby union player who represented Australia.
Rainbow, a fly-half, was born in London and claimed 1 international rugby cap for Australia.