This work is a revision of the scarab beetle genus Euphoria Burmeister (Coleoptera: Scarabaeidae: Cetoniinae) and is based on the examination of 18,880 specimens from 67 collections. Based upon a character study of all specimens examined, the genus is divided into 14 informal species-groups: areata species-group, avita species-group, biguttata species-group, candezei species-group, discicollis species-group, fulgida species-group, geminata species-group, hera species-group, herbacea species-group, histrionica species-group, inda species-group, pulchella species-group, sepulcralis species-group, and verticalis species-group. A description, a diagnosis, adult temporal occurrence, and geographic distribution are presented for each species. Maps of distribution and illustrations of key characters are also included. Bilingual (English and Spanish) keys for the species-groups and all species are included.