Birds
- Associations
- African Bird Club
- American Bird Conservacy
- American Birding Association
- American Federation of Aviculture
- American Ornithologists' Union
- Asociación Colombiana de Ornitología
- Association of Avian Veterinarians
- Association of Field Ornithologists
- Australasian Raptor Association
- Australian Bird Study Association
- Avicultural Society
- Avicultural Society of America
- Belize Audubon Society
- BirdLife International
- British Ornithologists' Union
- British Trust for Ornithology
- China Ornithological Society
- Cooper Ornithological Society
- Dutch Birding Association
- European Ornithologists' Union
- HawkWatch International
- Hellenic Ornithological Society
- International Ornithological Committee
- National Audubon Society
- National Finch and Softbill Society
- North American Bluebird Society
- Neotropical Bird Club
- Organization of Professional Aviculturists
- Oriental Bird Club
- Ornithological Council
- Ornithological Societies of North America
- Ornithological Society of Japan
- Ornithological Society of New Zealand
- Ornithological Society of Polynesia
- Ornithological Society of the Middle East
- Pacific Seabird Group
- Raptor Research Foundation
- Royal Australasian Ornithologists Union
- Sociedad Antioqueña de Ornitología
- Sociedad de Ornitología Neotropical
- Society for the Conservation and Study of Caribbean Birds
- Society of Avian Paleontology and Evolution
- Society of Canadian Ornithologists
- Waterbird Society
- West African Ornithological Society
- Wild Bird Society of Japan
- Wilson Ornithological Society