The term proprietary relates to property or ownership.
Proprietary may refer to:
- Proprietary chapel
- Proprietary church
- Proprietary colleges
- Proprietary colony
- Proprietary community
- Proprietary company
- Proprietary eponym
- Proprietary extension
- Proprietary format
- Proprietary hardware
- Proprietary lock-in
- Proprietary name
- Proprietary protocol
- Proprietary software
- Proprietary trading