Delany's mouse or Delany's swamp mouse is a species of rodent in the family Nesomyidae. It is the only species in the genus Delanymys and the only extant member of subfamily Delanymyinae, which also contains the fossil genus Stenodontomys. It was previously placed in subfamily Petromyscinae, but it is apparently not closely related to Petromyscus. It is found in Democratic Republic of the Congo, Rwanda, and Uganda. Its natural habitats are subtropical or tropical high-altitude shrubland and swamps. It is threatened by habitat loss.