| Seán Masterson | |
| Birth Date: | 1998 1, df=yes |
| Birth Place: | Portlaoise, Ireland |
| Weight: | 109kg (240lb) |
| Ru Position: | Flanker |
| Years1: | 2019– |
| Clubs1: | Connacht |
| Apps1: | 18 |
| Points1: | 0 |
| Ru Clubupdate: | 21 May 2022 |
| Relatives: | Eoghan Masterson (brother) |
Seán Masterson (born 27 January 1998) is an Irish rugby union player, currently playing for Pro14 and European Rugby Champions Cup side Connacht. He plays in the flanker.[1]
Masterson made his senior competitive debut for Connacht in their 41–5 victory against Benetton in the 2018–19 Pro14 on 5 October 2019. Sean Masterson came on as a replacement in this match.[2]