Seamus Joseph Byrne (born 7 June 1931) is an Irish former international rugby union player.
Byrne was raised in County Kildare, and is a brother of Ireland international Frank Byrne.
A wing three-quarter, Byrne is noted as being the first and only Ireland player to have scored a hattrick on international debut, a feat he achieved in a 26–8 win over Scotland at Edinburgh in 1953. He followed it up with his fourth career try in his next match in Swansea, but received only one further Ireland cap.
See also List of Ireland national rugby union players
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