Eilica fusca is a species of spider in the family Gnaphosidae. It is endemic to the Eastern Cape of South Africa.
Eilica fusca is known from the Eastern Cape province of South Africa, recorded from Dunbrody (southeast of Kirkwood) and Addo Elephant National Park.
The species is a free-living ground dweller sampled from the Thicket biome at 66 m above sea level.
Eilica fusca is known only from the female. The carapace is dark brown, the abdomen is dark grey without a pattern, and the legs are uniform dark brown. Total size is 4.2 mm.
Eilica fusca is listed as Data Deficient for taxonomic reasons. The species is known only from the type locality based on a single specimen collected in 1958. It is protected in Addo Elephant National Park. More sampling is needed to collect males and determine the species' range.
The species was originally described by Norman I. Platnick in 1975 from Dunbrody in the Eastern Cape.