Hydrocorax Brisson, 1760 Buceros is a genus of large Asian hornbills (family Bucerotidae).

All the hornbills in this genus have a large and hollow bony casque on their upper beak that can be useful to scientists and bird watchers to recognise their age, sex and species.

The genus Buceros was introduced in 1758 by the Swedish naturalist Carl Linnaeus in the tenth edition of his Systema Naturae.

[1] The name is from Latin becerus meaning "horned like an ox" which in turn is from the Ancient Greek boukerōs which combines bous meaning "ox" with kerōs meaning "horn".

The helmeted hornbill is sometimes included in this genus, but today most authorities place it in the monotypic Rhinoplax instead.