Pronophaea vidua is a spider species in the family Corinnidae. It is commonly known as the Midlands Pronophaea dark sac spider.
Pronophaea vidua is endemic to South Africa, where it is known from KwaZulu-Natal Province at two localities Kranzkloof Nature Reserve and Ngome State Forest.
This species consists of free-living ground dwellers that have been sampled from the Grassland and Savanna biomes at altitudes ranging from 344 to 1,002 m above sea level.
Pronophaea vidua is listed as Least Concern by the South African National Biodiversity Institute despite its limited range.
The species was originally described by Roger de Lessert in 1923 as Medmassa vidua from Krantzkloof, KwaZulu-Natal. Haddad & Bosselaers (2010) illustrated the female, but the male has not yet been described.