| Donald MacMillan | |
| Birth Name: | Donald Ian MacMillan[1] |
| Birth Date: | 22 September 1930 |
| Birth Place: | Toowoomba, Queensland |
| Death Date: | April 1982 (aged 51) |
| Death Place: | New Caledonia |
| Ru Position: | flanker |
| Repyears1: | 1950 |
| Repteam1: | Wallabies |
| Repcaps1: | 2 |
| Reppoints1: | 0 |
Donald Ian MacMillan (22 September 1930 – April 1982) was a rugby union player who represented Australia.
MacMillan, a flanker, was born in Toowoomba, Queensland, and won two caps for Australia.