The Lilleaker Line (Norwegian: Lilleakerbanen) is a suburban tramway from Skøyen in Oslo westwards to Jar, Bærum in Norway.

The line is owned by Sporveien and operated by Oslo Sporvognsdrift on contract with Ruter.

In 1912, Kristiania Elektriske Sporvei started working on plans to extend the street tram Skøyen Line towards Bestum or Øraker.

Construction began immediately, trial runs were made on 8 May 1919 and the line opened the following day.

An agreement was quickly reached with Kristiania Elektriske Sporvei (KES), that owned the Lilleaker Line.

In 1921, the municipal council voted in favor of the southern line after rejecting a proposal to negotiate trackage rights with Holmenkolbanen.

The main argument for the southern alternative was that the municipality would not have to pay any of the investment costs for the section of the line that would be localed within Aker.

The stations had a small building where there was a kiosk, telephone, ticket sale and freight handling.

At the same time, Aker Municipality's tram company Akersbanerne was left operating a single line east of the city center.

When it opened on 15 June 1942, the 11.9 kilometres (7.4 mi) section from Sørbyhaugen to Kolsås was designated the Kolsås Line, and the 3.8 kilometres (2.4 mi) section from Jar to Skøyen was designated as the Lilleaker Line.

[1] At the end of the war in 1945, the line was in need of a major overhaul, in particular the overhead wires.

The following year, Oslo Sporveier's Gullfisk were transferred to Bærumsbanen and designated Class E.[1] The Østensjø Line was closed to be converted to the metro standard on 18 June 1967, and from that day Line 9 only went from Jar to Oslo Central Station.

In 1971, Bærumsbanen was liquidated and ownership and all aspects of operation of the line was transferred to Oslo Sporveier.

During the low-frequency (20 minute) schedule, SL95 trams operate the entire Line 13 without any transfers needed.

[6] The curtailing of the line temporarily closed eliminated Øraker Station, despite local protests.