This species is endemic to southern Africa, ranging throughout the Northern Cape, Western Cape and Eastern Cape provinces of South Africa, with a marginal intrusion into southern Namibia, east to Lesotho and extreme western KwaZulu-Natal (Cavallini 2013). In 1990, an animal was trapped in Wakkerstroom, Mpumalanga, 200 km north of known records in KwaZulu-Natal and Lesotho (Bronner 1990). It is present from sea level around the Western Cape to 1,900 m asl in KwaZulu-Natal (Cavallini 2013). Although there is a slight overlap in the distribution range of Cape Grey Mongoose and that of the closely related Slender Mongoose (Herpestes sanguineus), it is speculated that the otherwise disjoint distribution ranges are a result of competitive exclusion between these species (Skinner & Chimimba 2005)