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- In this list of Birds of the Chatham Islands. In 1995, Chatham Islands County was dissolved and reconstituted by a specific Act of Parliament as the "Chatham Islands Territory", with powers similar to those of territorial authorities and some functions similar to those of a regional council. They form an archipelago in the Pacific Ocean about 650 kilometres (400 mi) east of mainland New Zealand.This list's taxonomic treatment and nomenclature (common and scientific names) mainly follows the conventions of The Clements Checklist of Birds of the World, 2022 edition. Some supplemental referencing is that of the Avibase Bird Checklists of the World as of October 2022. The species and subspecies marked extinct became extinct subsequent to humans' arrival in the Chatham Islands. About two thirds of the extinctions occurred after the arrival of Māori but before the arrival of pākehā (European New Zealanders) and the rest since pākehā arrived. Unless otherwise noted, all species listed below are considered to occur regularly in the Chatham Islands as permanent residents, summer or winter visitors, or migrants. The following codes are used to denote other categories of species:
* (I) Introduced - a species introduced to New Zealand by the actions of humans, either directly or indirectly
* (E) Extinct - a recent species that no longer exists
* (V) Vagrant - birds considered to be accidental visitors, with few modern records The Checklist of the birds of New Zealand, published in 2010 by Te Papa Press, in association with the Ornithological Society of New Zealand, is an authoritative list of Chatham Island birds. (en)
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