| Matthis Riou | |
| Birth Date: | 2001 1, df=y |
| Birth Place: | Plougrescant, France |
| Height: | 1.88m |
| Position: | Centre-back |
| Currentclub: | Guingamp |
| Clubnumber: | 26 |
| Youthclubs1: | Tréguier |
| Youthyears2: | 2013–2020 |
| Youthclubs2: | Guingamp |
| Years1: | 2020– |
| Clubs1: | Guingamp II |
| Caps1: | 18 |
| Goals1: | 0 |
| Years2: | 2021– |
| Clubs2: | Guingamp |
| Caps2: | 48 |
| Goals2: | 0 |
| Pcupdate: | 15 June 2024 |
Matthis Riou (born 19 January 2001) is a French professional footballer who plays as a centre-back for Guingamp.
A youth product of Tréguier, Riou signed with the youth academy of Guingamp in 2013 and worked his way up their youth teams. He debuted with their reserves in 2020.[1] On 4 June 2021, he signed his first professional contract with the club.[2] He made his professional debut with Guingamp in a 2–0 Ligue 2 loss to Amiens SC on 14 August 2021.[3]