Koleken (meaning "coming from clay and water") is a genus of carnotaurin abelisaurid from the Maastrichtian La Colonia Formation in the Chubut Province of Argentina.

The holotype, consists of "closely associated (but disarticulated) remains of the skull and atlas, as well as the articulated postcranial skeleton composed of the posterior most eight dorsal vertebrae, a complete sacrum, eight caudal vertebrae, an almost complete pelvis and hind limbs".

It differs from the larger Carnotaurus in anatomical characteristics found in the skull, vertebrae, and leg bones.

[1] The generic name, Koleken (IPA: [kɒːlɛkɛn]), is a name in Teushen spoken by the native population of central Patagonia that means "coming from clay and water", given the specimen was found in a sedimentary section dominated by claystone representing an estuarine environment.

The specific name, inakayali (IPA: [ɪnækæjælaɪ]), honours Inakayal, one of the last chiefs of Tehuelches, native people from central Patagonia.