| Aberglaube |
| Abracadabra |
| Abraxasgemmen |
| Adam |
| Aderlass-Männchen |
| Adlerstein |
| Agathodalwon, Rätsel des |
| Agla |
| Agrippa von Nettesheim |
| Ägyptisches Weltsystem |
| Albertus Magnus |
| Alchemie |
| Alembic |
| Allermannsharnisch |
| Alkahest |
| Almutin |
| Alp, Alb |
| Alraun |
| Aludel |
| Ambix |
| Ampelitis |
| Amulett |
| Andreas, Johann |
| Androgyn |
| Antichrist |
| Aquila |
| Arbatel |
| Arbor Philosophica |
| Arcandisziplin |
| Arcanum |
| Argentaurumcompany |
| Arnaldus Villanovanus |
| Artemidoros von Daldis |
| Ascendent |
| Aspekte |
| Astrologie |
| Astronomus |
| Athanor |
| Auripigment |
| Aurumnostrum |
| Avicenna |
| Azoth |