| Willie Duncan | |
| Full Name: | William Robert Duncan |
| Birth Date: | 14 July 1957 |
| Birth Place: | Belfast, Northern Ireland |
| Position: | Flanker |
| Repyears1: | 1984 |
| Repcaps1: | 2 |
| Reppoints1: | 0 |
William Robert Duncan (born 14 July 1957) is a former Irish international rugby union player from Northern Ireland.[1]
Born in Belfast, Duncan was a Malone flanker, capped twice by Ireland in the 1984 Five Nations. He made his debut against Wales at Lansdowne Road, then lost his place for the next fixture, before winning a recall at Twickenham when Fergus Slattery had to withdraw with illness.[2]
Duncan played on the Ulster team that defeated the 1984 Wallabies at Ravenhill.[3]