We conducted a study on diversity and habitat requirements of small mammals in the western part of the Albertine Rift, eastern Democratic Republic of Congo. The work aimed at providing a more complete list of species recorded to date and their habitat requirements to aid conservation efforts in the region. Trapping was conducted using Museum special, Victor traps, Sherman live traps and pitfall traps in four different habitats. A total of 57 species was recorded. Plantations and open habitats harbored the same species. In the forested areas we recorded 30 species which are not tolerant to disturbance. Eighteen species are Albertine Rift endemics. One species (Lophuromys cinereus), which is vulnerable and data deficient, has been recorded only in swamp. This study has recorded more species than the previous studies, some of which have not been reported in earlier studies. Differences between this and earlier studies are attributed to methods and the areas sampled. Some of the habitats sampled by previous workers have not been assessed. More research is needed, especially in swamps in mountain areas and in deep forests inhabited by species not present at lower altitudes.