Orm
- Anglo-Saxons
- Danelaw
- Danish language
- Earthsea
- Kirkdale sundial
- Norwegian language
- ORM-D
- Oak Ridges Moraine
- Object–relational mapping
- Object–role modeling
- Observatorio del Roque de los Muchachos
- Ocean Master
- Old Norse
- Online reputation management
- Online research methods
- OpenStreetMap
- Operational risk management
- Orm (given name)
- Orme (disambiguation)
- Ormulum
- Orn (disambiguation)
- Oromo language
- Orosomucoid
- Orrm
- Outsourcing relationship management
- Swedish language
- Sywell Aerodrome