Theridion cruciferum is a species of Theridiidae that is endemic to New Zealand.
This species was described in 1886 by Arthur Urquhart from female and male specimens.
The female is recorded at 5mm in length whereas the male is 4mm.
This species is known from Auckland, New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Data Deficient" with the qualifiers of "Data Poor: Size" and "Data Poor: Trend".