The Grimstad Line (Norwegian: Grimstadbanen) was a 22-kilometer (14 mi) long railway line between Grimstad and Rise in Norway. The line was a branch of the Arendal Line, which is in turn a branch of the Sørland Line. Opened as the Grimstad–Froland Line on 14 September 1907, it was originally a private railway. The line was nationalized and taken over by the Norwegian State Railways in 1912. The railway was originally built with 1,067 mm (3 ft 6 in) narrow gauge, but was converted to standard gauge in 1936. Because of the cumbersome transfers, the line had few passenger and little freight. It was closed and demolished in 1961.