- GenusTropicranus (sometimes included inTockus)
- White-crested HornbillTropicranus albocristatus
- Black Dwarf HornbillTockus hartlaubiRed-billed Dwarf HornbillTockus camurusMonteiro's Hornbill Tockus monteiriRed-billed Hornbill Tockus erythrorhynchusEastern Yellow-billed Hornbill Tockus flavirostrisSouthern Yellow-billed HornbillTockus leucomelasJackson's Hornbill Tockus jacksoniVon der Decken's Hornbill Tockus deckeniCrowned Hornbill Tockus alboterminatusBradfield's Hornbill Tockus bradfieldiAfrican Pied Hornbill Tockus fasciatusHemprich's Hornbill Tockus hemprichiiAfrican Grey Hornbill Tockus nasutus
- Genus Ocyceros
- Genus Rhinoplax (sometimes included inBuceros)
- Helmeted Hornbill Rhinoplax vigil
- Genus Penelopides
- GenusBerenicornis (sometimes included in Aceros)
- White-crowned Hornbill Berenicornis comatus
- Genus Aceros
- GenusRhyticeros (sometimes included inAceros)
- Genus Bycanistes (sometimes included in Ceratogymna).
- Genus Bucorvus
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