William Robert Duncan (born 14 July 1957) is a former Irish international rugby union player from Northern Ireland.

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.

Duncan played on the Ulster team that defeated the 1984 Wallabies at Ravenhill.

See also List of Ireland national rugby union players

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