Sikuomys is an extinct genus of mouse sized eutherian mammal. It lived during the Late Cretaceous epoch in the Prince Creek Formation which is in northern Alaska. The holotype was found by the Colville River and consists of a few teeth and part of the jawbone. Sikuomys weighed about 11 grams making it one of the smallest in its family. It is a relative of Gypsonictops and shared its environment with a species of Gypsonictops referred to as G. sp. It would have also shared it's environment with dinosaurs such as Nanuqsaurus, Alaskacephale, Troodon, and Pachyrhinosaurus.