Icius mbitaensis is a species of jumping spider in the genus Icius that lives in Kenya. It was first described in 2011 by Wanda Wesołowska. The spider lives communally in individual nests amongst other spiders and preys on insects, relying on its good eyesight to hunt diurnally. It is small, with a cephalothorax between 2.0 and 2.2 mm (0.079 and 0.087 in) long and an abdomen 2.2 and 2.7 mm (0.087 and 0.106 in) long. The female and male are similar in size and colouration of the carapace. The male abdomen is grey-brown with a faint pattern visible on some specimens. The female has a brown abdomen, sometimes more reddish-brown to the front, with some examples having a patch in the middle and spots to the back. The species is similar to other Icius spiders but differs in the size of the embolus and tibial apophysis of the male and the epigynal depression and pockets, seminal ducts and spermathecae of the female.

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