Codfish Island or Whenua Hou is a small island (14 km2/5.4 sq mi) located to the west of Stewart Island/Rakiura in southern New Zealand. It reaches a height of 249 m (817 ft) close to the south coast. The English name refers to the endemic blue cod or rawaru / pakirikiri, which is fished commercially in surrounding waters by trapping in baited pots. Whenua Hou means "new land" in Maori.
Following the eradication of possums and weka, Codfish is a predator-free bird sanctuary and the focus of Kakapo recovery efforts. It holds the majority of the breeding population of critically endangered Kakapo. It is also home to Southern Short-tailed Bats, Kaka, Fernbirds, Red-fronted and Yellow-crowned Parakeets, Little Penguins, Pacific Black Ducks and a recently introduced population of Yellowheads (Mohua).
The island is visited by scientific researchers and Department of Conservation field workers along with volunteers working on conservation programs. The sole hut is located at Sealer's Bay in the northeast, with access by light aircraft or helicopter. The island is closed to casual visitors and unauthorised landing is prohibited.