Zealaranea crassa is a species of orb-weaver spider that is endemic to New Zealand.
This species was first described as Epeira crassa by Charles Walckenaer in 1841. It has undergone numerous revisions, but was mostly recently revised in 1988. The holotype location is unknown.
The female is recorded at 9.2mm in length whereas the male is 6.2mm. The colour patterns of the body are extremely variable
This species is known from throughout New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Not Threatened".