Fontanet is a surname. Notable people with the surname include:
José Fontanet (1900–1941), Spanish water polo player Joseph Fontanet (1921–1980), French politician Patricio Fontanet (born 1979), Argentine singer-songwriter Pedro Mata y Fontanet (1811–1877), Spanish medical doctor Xavier Fontanet (born 1948), French businessman.
See also Fontanet, Indiana, an unincorporated census-designated place in Vigo County, Indiana Fontenet, a commune in the Charente-Maritime department in southwestern France