The Klampenborg Line (Danish: Klampenborgbanen) is a railway line between Copenhagen and Klampenborg in the northern suburbs of Copenhagen, Denmark. It is the shortest (13.3 km from København H) of the six radial lines of Copenhagen's S-train network, a hybrid commuter rail and rapid transit system serving Greater Copenhagen.
The line runs parallel to the Coast Line regional line from central Copenhagen until Klampenborg, and serves residential neighbourhoods in the eastern part of Gentofte Municipality as well as popular recreational destinations at Klampenborg such as the Dyrehavsbakken amusement park, the Jægersborg Dyrehave forest park or the Bellevue Beach.