Haplinis titan is a species of sheet weaver spider endemic to New Zealand.
This species was described as Mynoglenes titan in 1979 by A.D Blest from male and female specimens. It was moved to the Haplinis genus in 1984. This holotype is stored in Otago Museum.
The male is recorded at 9mm in length whereas the female is 7.91mm. This species has a dark brown cephalothorax and legs. The abdomen is brown with various pale markings.
This species is known from throughout New Zealand.
Under the New Zealand Threat Classification System, this species is listed as "Not Threatened".