Gigantea is a genus of land planarians from the Neotropical realm.

Species of Gigantea have a large, broad and flat body.

The copulatory apparatus has a permanent penis and the ovovitelline ducts enter the female atrium from below.

[1] This definition, however, is incomplete regarding the anatomical features currently considered in the definition of planarian genera and Gigantea is certainly a heterogeneous genus.

[1] Currently, there are 14 species assigned to the genus Gigantea: