Wiltonia nelsonensis is a species of Orsolobidae that is endemic to New Zealand.
This species was described in 1985 by Ray Forster and Norman Platnick from a female specimen collected in Nelson. The holotype is stored in Otago Museum.
The female is recorded at 3.20mm in length. The carapace and abdomen are patterned dorsally.
This species is only known from Nelson, 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".