Notomatachia wiltoni is a species of Desidae spider that is endemic to New Zealand.
This species was described by Ray Forster in 1970 from male and female specimens. The holotype is stored in Otago Museum.
The male is recorded at 5.61mm in length whereas the female is 6.54mm.
This species is only known from scattered localities throughout New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Not Threatened".