Bolafjall Radar Station (NATO ID: H-4) is an Icelandic General Surveillance Radar station and part of the Iceland Air Defence System.

[1] The station was established as a North Atlantic Treaty Organization (NATO) radar station in January 1992, with its construction cost paid by the NATO Infrastructure Fund.

[2] While the United States Air Force paid for its operational expenses,[3] it was operated by the Radar Agency (Icelandic: Ratsjárstofnun) with civilian staff.

[4] The mission of the station was to intercept and shadow all Soviet aircraft in transit in and from the GIUK gap which passed through the detection range of its radars and relay to the NAS Keflavik Radar Operations Control Center (ROCC).

[citation needed] In 2006, the United States withdrew its military units from Iceland, leaving the radar station fully in Icelandic hands.