Subantarctia stewartensis is a species of Orsolobidae.

[1] This species was described in 1956 by Ray Forster from male and immature female specimens collected in Stewart Island.

This species has deep reddish brown legs and carapace whereas the abdomen is creamy white.

[1] Under the New Zealand Threat Classification System, this species is listed as "Data Deficient" with the qualifiers of "Data Poor: Size", "Data Poor: Trend" and "One Location".

This article related to araneomorph spiders is a stub.