Cantuaria collensis is a species of trapdoor spider endemic to New Zealand.
This species was originally described as Arbanitis collensis in 1945 by Valerie Todd from a female specimen collected in the Foveaux Strait. It was transferred to the Cantuaria genus in 1968. The holotype is stored at Otago Museum.
The female has been recorded at 16.8mm in length. The carapace and legs are orange brown. The abdomen is reddish brown dorsally with pale patches.
This species is only known from Bench Island in 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".