Sector 3
- 2006 Noida serial murders
- Anchorage Air Route Traffic Control Center
- Area 3 (disambiguation)
- Bangladesh Armed Forces
- District 3 (disambiguation)
- Dwarka Sub City
- Ed Rush
- Getafe
- London Area Control Centre
- Noida
- Rohini Sub City
- Sector (disambiguation)
- Sector 3 (Bucharest)
- Sector 34 (Kharghar) metro station
- Sector 36
- Sector 37 (Gurugram) metro station
- Sector3 Studios
- Third sector (disambiguation)
- United Nations Mission in Liberia
- Vashi