Holothuria is the type genus of the marine animal family Holothuriidae,^[1] part of the class Holothuroidea, commonly known as sea cucumbers. Members of the genus are found in coastal waters in tropical and temperate regions. They are soft-bodied, limbless invertebrates which dwell on the ocean floor and are usually detritivores. They resemble a cucumber in form. The genus contains some species that are harvested and sold as food.

The World Register of Marine Species recognizes 163 species in 19 subgenera of Holothuria:^[1]