Millais is a surname, a given name, and a place name. It may refer to:
People with Millais as surname Hugh Millais (1929–2009), British author and actor Ivy Millais (1883-1969), British actress John Guille Millais (1865–1931), British artist, naturalist, gardener and travel writer Millais baronets, several people, including: John Everett Millais (1829–1896), English painter and illustrator Raoul Millais (1901–1999), British portrait painter, equestrian artist and sportsman
with Millais as a given name Millais Culpin (1874–1952), British psychologist
Places Millais School, English girls' school (Horsham, West Sussex)