Mangua kapiti is a species of Physoglenidae spider endemic to New Zealand.
This species was described in 1990 by Ray Forster from male specimens. The holotype is stored in Te Papa Museum.
The male is recorded at 3.02mm in length.
This species is only known from Wellington, New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Data Deficient" with the qualifiers of "Data Poor: Size" and "Data Poor: Trend".