Theridion squalidum is a species of Theridiidae that is endemic to New Zealand.
This species was described in 1886 by Arthur Urquhart from a female specimen.
The female is recorded at 5mm in length.
This species is only 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", "Data Poor: Trend" and "One Location".