Cucullus may refer to:
a Latin word referring to a hood of a garment, as in cucullus non facit monachum (The hood does not make the monk) a substructure of the valva, a structure in male insects that is used to hold the female during copulation a hood over the head of Ricinulei arachnids a synonym for Conus, the cone snails, a genus of predatory sea snails
See also Colpoda cucullus, a ciliate Trochoidea cucullus, a species of air-breathing land snail Cuculus, a bird genus