Cyonasua (meaning "dog-coati" in Greek) is an extinct genus of procyonid from the Late Miocene to Middle Pleistocene of South America.

[5][6] Cyonasua is the oldest terrestrial carnivoran known from South America, and represents the earliest undisputed southward mammalian migrants of the Great American Interchange.

The ancestors of Cyonasua are thought to have arrived from Central America by island hopping before the formation of the Isthmus of Panama.

This is thought to be one possible reason why Cyonasua and its close relatives were able to colonize South America many millions of years before other carnivorans.

[3][10] Limb bones of Cyonasua suggest that this genus was a generalized terrestrial mammal with some capability to dig and climb, similar to raccoons (Procyon) and coatis (Nasua).