The Horten Line (Norwegian: Hortenlinjen) was a 7.0-kilometer (4.3 mi) branch railway line of the Vestfold Line which ran from Skoppum to Horten, Norway. The line opened as a narrow gauge line on 13 October 1881, the same day as the Vestfold Line. The latter had been proposed to run through Horten, but instead a branch line was chosen. The Horten Line converted to standard gauge in 1949 and electrified in 1957. Passenger transport ran until 1968 and freight trains until 2002.