Collectively, Cercocebus and Mandrillus include nine species and two subspecies of African monkeys: seven species of Cercocebus and two of Mandrillus, including two drill subspecies. Together, they represent some of the least studied and hence least known of the Afro-Eurasian Primates. This Plan includes taxon-specific conservation actions, devised under six overarching themes: increase engagement and local livelihood support, reduce knowledge gaps, promote habitat restoration, raise the profile of Cercocebus and Mandrillus taxa, enhance protection, and respond to public health needs for the neighboring human populations. The Plan aimes to raise the profile of the Cercocebus and Mandrillus species, encourage collaboration amongst conservation practitioners, local communities, government agencies, and other invested parties, and ultimately prevent the extinction of some of the most amazing primate species on the planet.