Gauthier Grumier (born 29 May 1984 in Nevers) is a French 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 team mates Érik Boisse, Ulrich Robeiri and Fabrice Jeannet. He was also part of the French teams that won in 2010, 2011 and 2014.