Ommatoiulus is a genus of millipedes in the family Julidae. The taxonomy of the genus has had a complicated history. As it stands now, there are approximately 60 described species, but this is likely to change. At least 10 new species were described in 2012, and those just from Spain. There are many millipedes known to belong to this genus that do not yet have official names. Species include:
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0