Cyclosa trilobata is a species of orb-weaver spider that is native to New Zealand and Australia.

[1] This species was described as Arachnura trilobata in 1885 by Arthur Urquhart from female and male specimens collected in Auckland.

[3] It was most recently revised in 1917, in which it was moved to the Cyclosa genus.

[2] This species is native to New Zealand and Australia, including Tasmania.

[4] Under the New Zealand Threat Classification System, this species is listed as "Not Threatened" with the qualifier of "Secure Overseas".