Casto may refer to:
People Given name Casto (footballer) (born 1982), Spanish footballer Casto Innocenzio Ansaldi (1710–1780), Italian professor, theologian and archaeologist Casto Méndez Núñez (1824–1869), Spanish naval officer Casto Nopo, Equatoguinean football manager Casto Plasencia (1846–1890), Spanish painter
Surname Frank M. Casto (1875–1965), American orthodontist Immanuel Casto (born 1983), Italian songwriter Kory Casto (born 1981), American baseball player Martha Curnutt Casto (1812–1887), American murderer
Places Casto, Lombardy, Italy