Onthophagus is a genus of dung beetles in the Onthophagini tribe of the wider scarab beetle family, Scarabaeidae.

[4] It is the most species-rich and widespread genus in the subfamily Scarabaeinae (the 'true' dung beetles), with a global distribution.

[5] This genus includes around 30 subgenera and over 2,200 species.

[1][6] Some of the former subgenera of Onthophagus (including Proagoderus, Diastellopalpus, Digitonthophagus, and Euonthophagus) are now widely recognized as genera.

[7] These subgenera are in accordance with the Catalog of Life and the World Scarabaeidae Database (2023).