Julidae is a family of millipedes in the order Julida, containing more than 600 species in around 20 genera. Its members are largely confined to the Western Palaearctic, with only a few species extending into the Oriental and Afrotropical realms. They are united by a characteristic form of the mouthparts, and are classified in the superfamily Juloidea of the order Julida, alongside the families Trichoblaniulidae, Rhopaloiulidae and Trichonemasomatidae.

The family consists of the following genera:

Examples of species contained within this family include: - Brachyiulus pusillus - Cylindroiulus punctatus - Tachypodoiulus niger - Ommatoiulus moreletii - Megaphyllum unilineatum