Gauthier Grumier (born 29 May 1984, in Nevers) is a French left-handed épée fencer.

Grumier won the gold medal in the épée team event at the 2006 World Fencing Championships after beating Spain in the final.

He accomplished this with his teammates Érik Boisse, Ulrich Robeiri and Fabrice Jeannet.

[3] He won the silver medal in the individual épée event at the 2010 World Fencing Championships and at the 2015 World Fencing Championships.

[3][4] Grumier competed in the 2012 London Olympic Games and the 2016 Rio de Janeiro Olympic Games.