Spiroctenus coeruleus is a species of spider in the family Bemmeridae. It is endemic to KwaZulu-Natal province of South Africa.
Spiroctenus coeruleus has been recorded from Pietermaritzburg and Ndumo Game Reserve.
The species inhabits the Savanna Biome as a ground-dwelling burrow constructor.
Only males of Spiroctenus coeruleus are known to science. The cephalothorax and appendages appear slate blue due to a fine coating of powdery substance. The opisthosoma is pale brown above with small symmetrical darker markings, and yellow-brown below. The total length is 15 millimeters.
The species is listed as Data Deficient for taxonomic reasons, as females remain unknown and the full species range requires further study.