Cimolodon is a genus of the extinct mammal order of Multituberculata within the suborder Cimolodonta and the family Cimolodontidae.

The genus Cimolodon was named by Othniel Charles Marsh in 1889.

Kielan-Jaworowska & Hurum (2001) noted that Cimolodon seems to be more closely related to members of their "Paracimexomys" group than to other ptilodontoideans.

1889) is known from Late Cretaceous strata of the Lance Formation of Wyoming, Utah, Montana and South Dakota (United States) as well as Alberta and Saskatchewan (Canada).

[3] Cimolodon akersteni is known from the Cenomanian-age Wayan Formation of Idaho.