| Cimolomys Temporal range: Late Cretaceous,
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| Skull cast of C. gracilis | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | †Multituberculata |
| Family: | †Cimolomyidae |
| Genus: | †Cimolomys Marsh, 1889 |
| Type species | |
| †Cimolomys gracilis Marsh, 1889
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| Species | |
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Cimolomys (Greek for "chalk mouse") is a mammal genus from the Upper Cretaceous of North America. It was a member of the extinct order Multituberculata within the suborder Cimolodonta and family Cimolomyidae.
The genus Cimolomys was named by Othniel Charles Marsh in 1889.