Gauthier is a French surname (of Germanic origin, corresponding to the English given name Walter) and may refer to:
- Gauthier de Costes, seigneur de la Calprenède
- Gauthier de Brienne, Counts Walter III of Brienne, Walter IV of Brienne, Walter V of Brienne Walter VI of Brienne
- Gauthier of Esterp, saint
- Gauthier of Pontoise, saint
- Bernard Gauthier (b. 1924), French road racing cyclist
- Cathy Gauthier, Canadian curler
- Charles-Arthur Gauthier, Canadian politician
- Claude Gauthier, French Canadian Singer-songwriter
- Dan Gauthier, American actor
- Daniel Gauthier, Canadian ice hockey player
- David Gauthier, Canadian-American philosopher
- Denis Gauthier, Canadian ice hockey player
- Éric Gauthier, Canadian science fiction writer
- Eva Gauthier, Canadian mezzo-soprano and voice teacher
- Gabe Gauthier, American ice hockey player
- Gerard Gauthier, hockey linesman
- Henri Gauthier, comte de Rigny
- Jacques Gauthier, zoologist
- Jean Gauthier, French actor
- Jean-Baptiste Gauthier, French theologian
- Jean-Bernard Gauthier de Murnan, French general
- Jean-Robert Gauthier, Canadian politician
- Kerry Gauthier, Minnesota politician
- Léoda Gauthier, Canadian politician
- Marcel Gauthier, Canadian wrestler
- Marie-Madeleine Gauthier, A French Art Historian.
- Mary Gauthier, American singer
- Michel Gauthier, Canadian politician
- Mylène Gauthier, the Canadian-French singer Mylène Farmer
- Paul Gauthier, French theologian
- Paule Gauthier, Canadian lawyer
- Pierre Gauthier, Canadian ice hockey executive
- Pierre Gauthier, Canadian politician
- René-Antoine Gauthier, author of Magnanimité (1951)
- Sean Gauthier, Canadian ice hockey player
- Théophile Gauthier, French writer, usually Théophil Gautier