Juillet is a surname. Notable people with the surname include:
Chantal Juillet (born 1960), Canadian classical violinist Christophe Juillet (born 1969), French rugby union player Francisco Juillet (1898–1987), Chilean cyclist Patric Juillet, Australian film producer
See also Lake Juillet, a lake of Côte-Nord, Québec, Canada July, the month which is called "juillet" in French