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- Aardwolf and Hyenas (Hyaenidae)
- Abbahu
- Abbaye
- Abbey, Edward Paul (1927 – 1989) American Environmentalist and Writer
- Abélard, Pierre
- Abhinavagupta
- abiotic factors
- Abū Al-Hudhayl Al-ʿAllāf
- Abū Bakr
- Abū Ḥanīfah
