Runga raroa is a species of Physoglenidae spider endemic to New Zealand.
This species was described in 1990 by Ray Forster from male and female specimens. The holotype is stored in Otago Museum.
The male is recorded at 3.86mm in length whereas the female is 3.61mm. The male carapace is yellow brown with dark band dorsally (absent in the female).
This species is only known from Stewart Island, New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Naturally Uncommon" with the qualifier of "Range Restricted".