Episinus similanus is a species of Theridiidae spider endemic to New Zealand.

[1] This species was described in 1893 by Arthur Urquhart from female specimens.

The cephalothorax is yellow ochreous with brow markings dorsally.

[1] This species is only known from Waikato, New Zealand.

[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".