Nihoa is a spider genus in the mygalomorph family Barychelidae.
The genus is named after the island Nihoa, where the type species (N. mahina) is endemic.
N. hawaiiensis males have a length of almost 15 mm, including cheliceres; females are up to 21 mm.
Species of this genus occur in Oceania.
Nihoa annulata (Kulczynski, 1908) — New Guinea
Nihoa annulipes (Thorell, 1881) — New Guinea
Nihoa aussereri (L. Koch, 1874) — Palau
Nihoa bisianumu Raven, 1994 — New Guinea
Nihoa courti Raven, 1994 — New Guinea
Nihoa crassipes (Rainbow, 1898) — New Guinea
Nihoa gressitti Raven, 1994 — New Guinea
Nihoa gruberi Raven, 1994 — New Ireland
Nihoa hawaiiensis (Raven, 1988) — Hawaii
Nihoa itakara Raven, 1994 — New Guinea
Nihoa kaindi Raven, 1994 — New Guinea
Nihoa karawari Raven, 1994 — New Guinea
Nihoa lambleyi Raven, 1994 — New Guinea
Nihoa madang Raven, 1994 — New Guinea
Nihoa mahina Churchill & Raven, 1992 — Hawaii
Nihoa maior (Kulczynski, 1908) — New Guinea
Nihoa mambulu Raven, 1994 — Solomon Islands
Nihoa pictipes (Pocock, 1899) — New Guinea, New Britain, New Ireland, Solomon Islands
Nihoa raleighi Raven, 1994 — New Guinea
Nihoa tatei Raven, 1994 — New Guinea
Nihoa vanuatu Raven, 1994 — New Hebrides
Nihoa variata (Thorell, 1881) — New Guinea
Nihoa verireti Raven, 1994 — New Guinea
