Harry Byrne (born 22 April 1999) is an Irish rugby union player who plays for English Premiership club Bristol Bears on loan from URC club Leinster.

[3] Following his pre-season performances, Byrne was selected on the bench for Leinster's opening 2019–20 Pro14 fixture away to Italian side Benetton on 28 September 2019, and he replaced older brother Ross in the 69th minute, scoring a late penalty to secure a 32–27 win for Leinster.

[4][5] In December 2024, he joined Bristol Bears in the Premiership on a three-month loan deal to provide injury cover for AJ MacGinty.

[6] In January 2025, he made his debut off the bench in the Premiership converting two tries but losing 35–26 to Saracens.

[8] Byrne scored six points in his debut off the bench for the Ireland senior side, in a 71–10 victory over the United States on 10 July 2021.