Plexippus wesolowskae is a species of jumping spider in the genus Plexippus that lives in Bangladesh. It was first described in 1998 by V. Biswas and D. Raychaudhuri. The spider is medium-sized, with a carapace 3.4 mm (0.13 in) and an abdomen 3.2 mm (0.13 in) long. The carapace is dark brown with a black band and white cross. The abdomen is a lighter brown with one white and two black stripes. It is similar to the related Plexippus paykulli that can also be found in the same country, but can be distinguished by features like the elongated almost vase-like shape of the sternum and lack of tibial apophysis on the palpal bulb.

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