Alistra napua is a species of Hahniidae spider endemic to New Zealand.
This species was described as Tawerana napua in 1970 by Ray Forster from a male specimen. In 1986 it was transferred to the Alistra genus. The holotype is stored in Otago Museum.
The female is recorded at 2.12mm in length. The carapace is yellow brown with black markings dorsally. The legs have black bands. The abdomen is cream with black markings dorsally.
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", "Data Poor: Trend" and "One Location".