| Guillaume Ducat | |
| Birth Name: | Guillaume Ducat |
| Birth Date: | df=yes 25 May 1996 |
| Birth Place: | Tarbes, France |
| Height: | 2.05 m (6 ft 8 ½ in) |
| Weight: | 115 kg |
| Ru Position: | Lock |
| Ru Clubyears: | 2015–2021 2021– |
| Ru Proclubs: | Bayonne Pau |
| Ru Clubcaps: | 77 17 |
| Ru Clubpoints: | (10) (0) |
| Ru Clubupdate: | 9 October 2021 |
| Ru Nationalyears: | 2020– |
| Ru Nationalteam: | France |
| Ru Nationalcaps: | 1 |
| Ru Nationalpoints: | (0) |
| Ru Ntupdate: | 6 Dec 2020 |
Guillaume Ducat (born 25 May 1996) is a French rugby union player. His position is Lock and he currently plays for Pau in the Top 14.[1]