Gaudet or Guadet is a French surname. Notable people with the surname include:
Christopher Gaudet, Canadian actor Daniel Gaudet (born 1959), Canadian gymnast Elisa Gaudet, American golf writer Francine Gaudet (born 1948), Canadian politician Joseph Gaudet (1818–1882), Canadian politician Julien Guadet (1834–1908), French architect and professor Kevin Gaudet (born 1963), Canadian ice hockey coach Marguerite-Élie Guadet (1758–1794), French politician Mia M. Gaudet, American cancer epidemiologist Pete Gaudet (born 1942), American basketball coach Roger Gaudet (born 1945), Canadian politician Suzanne Gaudet (born 1981), Canadian curler Wayne Gaudet (born 1955), Canadian politician
See also Château Guadet, a winery in Saint-Émilion, Bordeaux, France Gaudet Mater Ecclesia, the opening declaration of the Second Vatican Council