This paper presents an annotated checklist of the non-marine molluscs of Mount Kenya, based on species records in the literature, museum collections and the results of a National Museums of Kenya Darwin Initiative field study of the molluscs of the forest zone in 1996/97. The checklist is divided into 3 parts. The first contains a total of 111 species (104 terrestrial and 7 freshwater) which have well-authenticated records for Mt Kenya. The second list contains 17 species (15 terrestrial and 2 freshwater) that may occur on Mt Kenya since they have been reported from the central Kenyan highlands generally. The third list consists of 7 terrestrial species that have been reported from Mt Kenya but which are probably errors. The paper also presents a brief assessment of the biogeographical and ecological affinities of the Mt Kenya mollusc fauna, and of the species that appear to be endemic on the mountain.