Oliva is a genus of medium-sized to large sea snails, marine gastropod mollusks in the subfamily Olivinae of the family Olividae, the olive snails or olive shells. Many former species of Oliva have been reclassified under genus Americoliva.

Olive snails, also known as olive shells and olives, scientific name Olividae, are a taxonomic family of medium to large predatory sea snails with smooth, shiny, elongated oval-shaped shells.