The American Ornithologists' Union (AOU) is the oldest and largest ornithological organization in the Western Hemisphere. Unlike the National Audubon Society, its members are primarily professional ornithologists rather than amateur birdwatchers.

It was founded in September 1883 by Elliott Coues, Joel Asaph Allen and William Brewster.

Its quarterly journal, The Auk, has been published since January, 1884. Other significant publications include the AOU Checklist of North American Birds, which is the standard reference work for the field, and a monograph series, Ornithological Monographs.

External link

• AOU website

American professional bodies | Ornithological organizations

American Ornithologists' Union | American Ornithologists' Union