An updated checklist of all currently accepted species of Enchytraeidae (Oligochaeta, Clitellata, Annelida) is presented. The list comprises 676 species, which add up to 715 species-group taxa when subspecies and controversial species are included. Species-richest genera are Fridericia (99 species) and Marionina (96 species), followed by Lumbricillus (80 species), Mesenchytraeus (76 species), and Grania (71 species). Six genera are monospecific. Given the generally poor knowledge of Enchytraeidae in most regions on earth, these numbers most probably represent only a minute fraction of the actual diversity, but reasonable estimates as to the actual number of enchytraeid species are not possible at present. For reasons of homonymy, Henlea dicksoni (Nurminen, 1980) and Henlea irkutensis (Nurminen, 1980) are renamed into Henlea dicksoniana and Henlea irkutiana, respectively.