Diploplecta simplex is a species of Linyphiidae spider that is endemic to New Zealand.
This species was described in 1988 by Alfred Frank Millidge from female specimens. The holotype is stored in Otago Museum.
The female is recorded at 1.9mm in length. This species has a pale yellow carapace with a black markings dorsally and laterally. The legs are pale brown. The abdomen is whitish brown with black markings.
This species is only known from Auckland and Masterton in the North Island of New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Not Threatened".