Østhorn (until 1939 Korsvoll) is a station on the Sognsvann Line (line 6) of the Oslo Metro in Norway. It is located 7.1 kilometres (4.4 mi) from Stortinget station between Tåsen and Holstein stations. As one of the original stations on the line, Østhorn was opened on 10 October 1934. Nordberg was formerly the next northbound station, but it was closed in 1992, when the Sognsvann Line was upgraded to metro standard.