Cassionympha detecta, the Cape brown, is a butterfly of the family Nymphalidae.

It is found in South Africa, in the mountains of the Western Cape from Cederberg to Swartberg down to the coast, then along the south-east coast and hills to the Eastern Cape and into Great Karoo.

Adults are on wing from September to April (with a peak from October to March).

[2] The larvae feed on various sedges and restios, including Ficinia ramosissima, Ficinia elongata, possibly Ficinia acuminate, Restio species, including Restio tenuissimus.

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