Hemiscorpius is the sole genus of the scorpion family Hemiscorpiidae, with about 16 described species. Before Hemiscorpiidae, the term used for the family was Ischnuridae, which had to be changed due to a naming conflict with the damselfly family of the same name. They at one point also held the name Liochelidae.

In 2015, research on the evolution, biogeography and phylogeny of the families Hormuridae, Hemiscorpiidae, and Heteroscorpionidae left Hemiscorpiidae with a single genus, Hemiscorpius, the remaining 15 merged or transferred to other families.

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