Encyclopedias, Almanacs, Transcripts, and Maps
- Angleheads, Calotes, Dragon Lizards, and Relatives (Agamidae)
- Angora
- Anguilliformes (Eels and Morays)
- Ani Lochen
- Animal and Human Energy
- Animal Cancer Tests
- Animal Legal Defense Fund
- Animal Waste
- Animal Welfare Institute
- Animism and Animatism
- Anishinaabe Religious Traditions
- Annwn
- anodizing
- Anoles, Iguanas, and Relatives (Iguanidae)
- Anopla (Anoplans)
- Anostraca (Fairy Shrimps)
- Anseriformes (Ducks, Geese, Swans, and Screamers)
- ant lion
- Ant Thrushes (Formicariidae)
- Antarctic Treaty (1961)