Encyclopedias, Almanacs, Transcripts, and Maps
- Amandinus
- Amaranth Family (Amaranthaceae)
- Amaranth Family (Amaranthaceae)
- Amaro José
- Amaryllis family (Amaryllidaceae)
- Amaryllis Family (Amaryllidaceae)
- Ambrosius Theodosius Macrobius
- Amduscias
- Amebic Dysentery
- Amedeo Avogadro Conte di Quaregna
- Amelia Mary Earhart
- Amenemhet III
- American Academy of Astrologians
- American Academy of Forensic Sciences
- American Association of Meta-Science
- American Association—Electronic Voice Phenomena
- American Astrological Society
- American Astrology (Magazine)
- American Diabetes Association
- American Dietetic Association