Big Bay (LAB-4) is a Royal Canadian Air Force Short Range Radar Site located on the coast of Labrador, north of CFB Goose Bay, Newfoundland and Labrador.
The facility contains a Short Range AN/FPS-124 doppler airborne target surveillance radar that was installed in September 1992 as part of the North Warning System. The site (LAB-4) also consists of radar towers, communications facility, and storage and tunnel connected buildings for personnel.