Science magazines
- Alani (Melicope zahlbruckneri)
- Aleutian Canada Goose
- Aleutian Shield Fern
- Alsinidendron Obovatum
- Alsinidendron Trinerve
- Alsinidendron Viscosum
- Amaranthus brownii
- Amargosa Niterwort
- Amargosa Vole
- Amber Darter
- American Alligator
- American Burying Beetle
- American Chaffseed
- American Crocodile
- American Hart's-tongue Fern
- American Peregrine Falcon
- Anthony's Riversnail
- Antioch Dunes Evening-primrose
- Anunu
- Apache Trout