| Oneiromantie |
| Oni |
| Onokentaur |
| Onomantie |
| Onychomantie |
| Opfer |
| Ophiel |
| Ophiolatrie |
| Ophiten |
| Ophitische Kraft |
| Opposition |
| ORA |
| Orakel |
| Orbis |
| Ordal |
| Ordensname |
| Ordo Templi Orientis (OTO) |
| Ordo Rosae Rubeae et Aureae Crucis, "Rubinrose und Goldkreuz" |
| Oreaden |
| Orenda |
| Orgie |
| Origenes aus Alexandrien |
| Ork, Nork, Norg |
| Ormuzd |
| Ornithomantie |
| Orpheus |
| Orphik |
| Osiris |
| Osis, Karlis |
| Osmond, Humphrey |
| Ostara |
| Osten |
| Osty, Eugene |
| Otto, Rudolf |
| Otz Chiim |
| Oui-ja-Board |
| Ousby, W.J. |
| Ouspensky, Peter Demianowitsch |
| Owen, Alan R.G. |
| Oxalis |