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The kiwi, pronounced as /ˈkiːwiː/ KEE-wee, are flightless birds native to New Zealand, belonging to the genus Apteryx (/ˈæptərɪks/) and family Apterygidae (/ˌæptəˈrɪdʒədiː/). Despite being approximately the size of a domestic chicken, kiwi are the smallest living ratites, a group that also includes ostriches, emus, rheas, and cassowaries. Surprisingly, DNA comparisons have shown that kiwi are more closely related to the extinct Malagasy elephant birds than to the moa, with whom they shared New Zealand.

There are five recognized kiwi species, four of which are currently classified as vulnerable, and one as near-threatened. Historical deforestation has negatively impacted all species, but their remaining forest habitats are now well protected in reserves and national parks. However, the primary threat to their survival is predation by invasive mammalian predators.

One of the distinctive features of kiwi is their egg, which is one of the largest in proportion to body size of any bird species, weighing up to 20% of the female's weight. Other unique adaptations include their hair-like feathers, short and stout legs, and the use of their nostrils at the end of their long beak to detect prey before seeing it.

Kiwi are iconic symbols of New Zealand, so much so that the term "Kiwi" is commonly used internationally as a colloquial demonym for New Zealanders. Adapted for terrestrial life, kiwi lack a keel on the sternum for wing muscle attachment and have vestigial wings hidden beneath their feathers. Unlike most birds, kiwi have marrow in their bones and lack a uropygial gland.

With a long, pliable bill and reduced eyesight, kiwi rely heavily on their other senses such as auditory, olfactory, and somatosensory systems for survival and foraging. Despite their small visual field and underdeveloped sight, kiwi exhibit large encephalization quotients, suggesting more complex behavior than expected based on brain size.