Diopsiulus is a genus of millipedes in the family Stemmiulidae.

Species Species accepted as of May 2025: Diopsiulus annandalei Diopsiulus biroi Diopsiulus ceylonicus Diopsiulus giffardii Diopsiulus greeni Diopsiulus jeekeli Diopsiulus madaraszi Diopsiulus parvulus Diopsiulus pencillatus Diopsiulus remifer Diopsiulus schioetzae

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