Xanclomys is a small mammal from the Paleocene of North America. It was a genus within the extinct order Multituberculata within the suborder Cimolodonta and family Neoplagiaulacidae.

Xanclomys Temporal range: Torrejonian PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Multituberculata
Family:	†Neoplagiaulacidae
Genus:	†Xanclomys
Species:	†X. mcgrewi
Binomial name
†Xanclomys mcgrewi Rigby J.K., 1980

The genus Xanclomys, named by Rigby J.K. in 1980, is also known as Xancolomys. The identification is based on a single species, Xanclomys mcgrewi. Fossil remains were found in the Torrejonian (Paleocene)-age strata of the Swain Quarry in Wyoming (U.S.). Affinities are uncertain. There's perhaps a second, unnamed species.