Sector 3, Sector III or variants may refer to:
Municipal sectors
- Sector 3 (Bucharest), an administrative sector of Bucharest, Romania
- A sector of Dwarka Sub City, Delhi, India
- A sector of Rohini Sub City, Delhi, India
- A sector of Vashi, India
- Sector III, a neighbourhood in Getafe, Spain
Military sectors
- A sector of the United Nations Mission in Liberia
- A defence sector of the Bangladesh Armed Forces
Air traffic sectors
- Part of a holding pattern
- A sector of Anchorage Air Route Traffic Control Center coverage area
- A sector of London Area Control Centre coverage area
Other uses
- "Sector 3", a 1996 single by Ed Rush
- Sector3 Studios, a Swedish video game developer
See also
- Sector (disambiguation)
- Third sector (disambiguation)
- District 3 (disambiguation)
- Area 3 (disambiguation)
- Sector 36, a sector of Noida, Uttar Pradesh, India
- Sector 36, a 2024 Indian crime thriller film about the 2006 Noida serial murders
- Sector 34 (Kharghar) metro station, of the Navi Mumbai Metro in India
- Sector 37 (Gurugram) metro station, of the Delhi Metro in India