Abaycosa is a genus of spiders in the family Lycosidae (wolf spiders).
Abaycosa is found in South America, from Brazil to Argentina.
The genus name is a combination of "Abáy" and the common lycosid ending "-cosa". "Abáy" mens "spider" in the indigenous Chaná language that is spoken in the basins of the Paraná and Uruguay rivers.
, this genus includes two species: