Spiroctenus fuligineus is a species of spider in the family Bemmeridae. It is endemic to the Eastern Cape province of South Africa.
Spiroctenus fuligineus is known only from the type locality at Brakkloof.
The species inhabits the Thicket Biome as a ground-dwelling burrow constructor.
Only females of Spiroctenus fuligineus are known to science. The body and legs are very dark, appearing uniformly blackish grey. The total length is 20 millimeters.
The species is listed as Data Deficient for taxonomic reasons, as males remain unknown and the full species range requires further study.