Closed
- Close (disambiguation)
- Closed (album)
- Closed (poker)
- Closed GmbH
- Closed class
- Closed differential form
- Closed interval
- Closed line segment
- Closed loop (disambiguation)
- Closed manifold
- Closed set
- Closed tournament
- Closing (disambiguation)
- Closure (disambiguation)
- Closure (mathematics)
- Open (disambiguation)