Diaea rohani is a species of spider in the family Thomisidae. It is found in southern Africa and is commonly known as Rohan's Diaea crab spider.
Diaea rohani is found in Angola and South Africa.
In South Africa, it is known from the provinces Eastern Cape, Free State, Gauteng, KwaZulu-Natal, and Western Cape.
Diaea rohani inhabits Grassland and Savanna biomes at altitudes ranging from 496 to 1844 m above sea level.
These free-living plant dwellers are found on trees, shrubs and grasses.
Diaea rohani is listed as Least Concern by the South African National Biodiversity Institute due to its wide geographical range. It is protected in Aardvark Nature Reserve.
Diaea rohani was described by Fage in 1923 from Angola. The species is known only from the male.