Los dinornítidos o moas (Dinornithidae) son una familia extinta de aves paleognatas del orden Dinornithiformes. Eran aves no voladoras que habitaban en Nueva Zelanda. Se conocen diez especies de diferentes tamaños, desde la pequeña Eurayapteryx curtus, del tamaño de un gallo, hasta las moas gigantes (Dinornis), que medían cerca de 3 metros de altura y tenían un peso de 250 kg. Su extinción se produjo hace 500 años, causada por el ser humano.

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The moa were nine species (in six genera) of flightless birds endemic to New Zealand. The two largest species, Dinornis robustus and Dinornis novaezelandiae, reached about 3.6 m (12 ft) in height with neck outstretched, and weighed about 230 kg (510 lb). When Polynesians settled New Zealand around CE 1280, the moa population was about 58,000. Moa belong to the order Dinornithiformes, traditionally placed in the ratite group. However, their closest relatives have been found by genetic studies to be the flighted South American tinamous, once considered to be a sister group to ratites. The nine species of moa were the only wingless birds, lacking even the vestigial wings which all other ratites have. They were the dominant herbivores in New Zealand's forest, shrubland and subalpine ecosystems for thousands of years, and until the arrival of the Māori were hunted only by the Haast's eagle. Moa extinction occurred around CE 1300 - CE 1440 ± 20 years, primarily due to overhunting by Māori.

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