Oesophagostomum mocambiquei Ortlepp, 1964 was described from 9 females recovered from a warthog, Phacochoerus aethiopicus (Pallas, 1766), from northern Mozambique. Large numbers of O. mocambiquei were recovered during subsequent surveys of the parasites of warthogs from the Kruger National Park and the Hoedspruit Nature Reserve. The males, which have not yet been described, resemble those of Oesophagostomum santosdiasi Ortlepp, 1964 in the principal measurements. They can, however, be differentiated by the shape of the mouth capsule, which is round in O. mocambiquei and oval in O. santosdiasi. A simplified key for the identification of the Oesophagostomum species that occur in warthogs in South Africa and Namibia is provided and the differences between them tabulated. The names Oesophagostomum moçambiquei and Oesophagostomum santos-diasi are corrected to O. mocambiquei and O. santosdiasi respectively, since diacritic marks are not allowed under the Code of International Zoological Nomenclature.