Julida is an order of millipedes. Members are mostly small and cylindrical, typically ranging from 10 - 120 mm in length. Eyes may be present or absent, and in mature males of many species, the first pair of legs is modified into hook-like structures. Additionally, both pairs of legs on the 7th body segment of males are modified into gonopods.

Julida contains predominantly temperate species ranging from North America to Panama, Europe, Asia north of the Himalayas, Asir region, Saudi Arabia, and Southeast Asia.

The order Julida contains approximately 750 species, divided into the following superfamilies and families: - Blaniuloidea C. L. Koch, 1847 - Blaniulidae C. L. Koch, 1847 - Galliobatidae Brolemann, 1921 - Okeanobatidae Verhoeff, 1942 - Zosteractinidae Loomis, 1943 - Juloidea Leach, 1814 - Julidae Leach, 1814 - Rhopaloiulidae Attems, 1926 - Trichoblaniulidae Verhoeff, 1911 - Trichonemasomatidae Enghoff, 1991 - Nemasomatoidea Bollman, 1893 - Chelojulidae Enghoff, 1991 - Nemasomatidae Bollman, 1893 - Pseudonemasomatidae Enghoff, 1991 - Telsonemasomatidae Enghoff, 1991 - Paeromopodoidea Cook, 1895 - Aprosphylosomatidae Hoffman, 1961 - Paeromopodidae Cook, 1895 - Parajuloidea Bollman, 1893 - Mongoliulidae Pocock, 1903 - Parajulidae Bollman, 1893