Cocytius is a genus of hawkmoths (family Sphingidae).

The genus was erected by Jacob Hübner in 1819.

[1] As of February 2021[update], the Sphingidae Taxonomic Inventory accepts eight species.

The genera Amphonyx, Ancistrognathus, Morcocytius and Pseudococytius are treated as synonyms.

This Sphinginae-related article is a stub.