Icius insolidus is a species of jumping spider in the genus Icius that lives in Namibia and South Africa. First described in 1999 by Wanda Wesołowska and allocated to the genus Menemerus, the species was transferred to its current genus in 2006.

It lives in rocky environments, primarily granite rocks and boulders, but also the walls of gardens. It is a small spider, with a carapace between 1.8 and 2.4 mm (0.071 and 0.094 in) and an abdomen between 1.7 and 2.4 mm (0.067 and 0.094 in) in length. It is very dark brown or black. The male carapace and abdomen have a white stripe down the middle. The female abdomen has a vague white leaf-like pattern on the top. The male has a prominent tooth (projection) on the base of the chelicerae. It is this tooth that helps distinguish the species from others in the genus. The female epigyne has two widely separated rounded depressions. The species lives in nests, and the male and female will often share a nest after mating.

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