Diplognatha is a genus of beetle belonging to the family Scarabaeidae, subfamily Cetoniinae.
Species of this genus are of medium size (approx. 20–27 mm). The body is slightly oblong and flat, with a shiny surface, usually black or brown, but some species have a distinct metallic sheen. A sexual dimorphism is barely visible. The larvae usually live in the soil, but some species are supposed to develop in bird and bee nests. In some species, the adult beetles live for several years, which is relatively uncommon.
These beetles live in tropical Africa. The species Diplognatha gagates is found almost everywhere in Africa south of Sahara.