Cladosictis (meaning "branch weasel") is an extinct genus of South American metatherian from Patagonia, Argentina (Chichinales, Cerro Bandera, Sarmiento and Santa Cruz Formations) and Chile (Río Frias Formation).

[1] Cladosictis was a fox-like creature that was around 80 centimetres (2.6 ft) long.

Cladosictis probably hunted for eggs and small animals in the low undergrowth, using its low posture for cover.

With sharp canines and slicing carnassials, Cladosictis's teeth were similar to those of carnivorans, although the groups were unrelated.

This article about a prehistoric marsupial is a stub.