Sector 3

Sector 3, Sector III or variants may refer to:

Municipal sectors

 * Sector 3 (Bucharest), an administrative sector of Bucharest, Romania
 * A sector of Rohini Sub City, 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