Dakotamys is a genus of extinct mammal that lived during the Upper Cretaceous. It shared the world with dinosaurs. This small creature was a member of the also extinct order Multituberculata within the suborder Cimolodonta and was a member of the Paracimexomys group.

Dakotamys Temporal range: Late Cretaceous
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Multituberculata
Suborder:	†Cimolodonta
Genus:	†Dakotamys
Species:	†D. malcomi
Binomial name
†Dakotamys malcomi Eaton J.G., 1995

The genus Dakotamys ("Dakota mouse") was named by Eaton J.G. in 1995. Dakota refers to the Dakota Formation. "Paracimexomys and Dakotamys... resemble the Eobaataridae in the structure of the upper and lower molars, with cusps showing a tendency to coalesce, and with ornamentation of grooves and ribs on the molars," (Kielan-Jaworowska & Hurum, 2001, p. 403).