Rhaeboctesis denotata is a species of spider in the family Miturgidae. It occurs in southern Africa and is commonly known as the Namibia Rhaeboctesis sac spider.
Rhaeboctesis denotata is found in Angola, Namibia, Botswana, and South Africa. In South Africa, it is known only from the Northern Cape province, specifically from Prieska (Green Valley Nuts Estate).
The species inhabits Nama Karoo biomes at an altitude of 950 m above sea level. These free-running ground spiders have also been sampled from pistachio orchards. They are rare and little is known about their behaviour.
Rhaeboctesis denotata is known only from females.
Rhaeboctesis denotata is listed as Least Concern due to its wide range across southern Africa. However, the species is possibly still under-sampled in South Africa, and threats to this species are not considered significant.
The species was originally described by Reginald Frederick Lawrence in 1928 from Namibia. It remains unrevised.