Iolaus mimosae, the mimosa sapphire, is a butterfly of the family Lycaenidae. It is found in southern Africa. The habitat consists of Karoo and savanna.

The wingspan is 26–31 mm for males and 30–32 mm for females. Adults are on wing from September to March with a peak from October to November. There are one or more generations per year.

The larvae feed on Actinanthella wyliei, Agelanthus natalitius, Moquinella rubra, Oncocalyx fischeri, Plicosepalus curviflorus, Plicosepalus kalachariensis and Tapinanthus dichrous.

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