Plexippus fuscus is a species of jumping spider in the genus Plexippus that lives in Guinea. It was first described in 2002 by Christine Rollard and Wanda Wesołowska. Only the female has been described. It is a medium-sized spider, with a dark brown carapace typically 3.4 mm (0.13 in) long and a reddish-brown abdomen that is 2.3 mm (0.091 in) long. Both the carapace and abdomen are covered in dark brown hairs. The abdomen has a yellow marking like a belt. Although superficially similar to other species in the genus like Plexippus paykulli, it can be distinguished by the presence of a long thin pocket in the epigyne and significant sclerotisation on the edges of the copulatory openings, which are also wider than other Plexippus spiders.

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