Theropithecus oswaldi is an extinct species of Theropithecus from the early to middle Pleistocene of Kenya, Ethiopia, Tanzania, South Africa, Spain, Morocco and Algeria. It appears to have been a specialised grazer. The species went extinct in South Africa around 1.0 Ma. Having existed alongside hominins like Homo erectus, it is likely that conflict with early humans played a role in their extinction as a site has been found with many juveniles butchered. It is remarkable for its large size compared to other old world monkeys.