Helsfyr is a subway station on the east side of the Oslo Metro system located in the borough of Gamle Oslo. The station is shared by the Furuset Line (Line 2), the Østensjø Line (Line 3) and the Lambertseter Line (Line 4). In addition, Line 1, which runs on Holmenkollen Line in the west, terminates at Helsfyr (during rush hour, however, line 1 is extended to Ellingsrudåsen).