Stanwellia puna is a species of mygalomorph spider endemic to New Zealand.
This species was described as Aparua puna in 1968 by Ray Forster from a single female specimen collected in Cuvier Island. It was transferred into the Stanwellia genus in 1983. The holotype is stored at Otago Museum.
The female is recorded at 11.3mm in length. The carapace and legs are orange brown. The abdomen is cream with reddish brown markings dorsally.
This species is only known from Cuvier Island, New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Naturally Uncommon" with the qualifiers of "Island Endemic" and "One Location".