| Birth Name: | Arnaud Marchois |
| Birth Date: | 24 June 1983 |
| Birth Place: | Châtenay-Malabry, France |
| Weight: | 118kg (260lb) |
| Ru Position: | Lock |
| Ru Clubyears: | 2001–2011 2011– |
| Ru Proclubs: | Stade Français Lyon OU |
| Ru Clubcaps: | 186 4 |
| Ru Clubpoints: | (0) (0) |
Arnaud Marchois (born 24 June 1983) is a French rugby union footballer, currently playing for Lyon OU in the Top 14. His usual position is at Lock. Prior to joining Lyon OU he played for Stade Français where he won the Top 14 in 2003, 2004 and 2007.