Wainka is an extinct genus of South American mammal, belonging to the order Litopterna.

The upper molars were almost triangular in shape, elongated, and possessed a rather massive paracone and metacone, more developed than other contemporary South American ungulates such as Anisolambda ; the upper molars were devoid of mesostyle.

With some doubts, Wainka has also been attributed a lower molar with well-marked ridges.

Wainka tshotshe was first described in 1935 by George Gaylord Simpson, based on an upper and lower molar, the latter of dubious attribution, from the Middle Paleocene of Cerro Redondo, Argentina.

This animal has been attributed to various families of South American ungulates, such as the Notonychopidae and Proterotheriidae.