Stortinget is an underground rapid transit station on the Common Line of the Oslo Metro, Norway.

The rapid transit station opened as Sentrum in 1977, and was connected to the eastern network of the metro.

The first underground railway to serve Oslo was the extension of the Holmenkoll Line to Nationaltheatret in 1928.

The company, Holmenkolbanen, had plans for further extensions into the heart of the city, but high costs during the construction of the initial tunnel hampered progress.

In 1954, the Parliament of Norway decided to build a rapid transit system for Oslo.

Four lines to the east of the city would be built, and in 1966 the section from Tøyen to Jernbanetorget opened by Oslo Sporveier.

[2] Simultaneously, Oslo Sporveier worked with possibilities to connect their eastern and western networks, and get both into the city core.

During the 1960s, the planning office for the metro proposed to build a connecting tunnel between Nationaltheatret and Jernbanetorget.

However, the initial plans involved creating a station close to Nationaltheatret, named for Slottsparken, which would serve as the transfer point between the two systems.

[4] The initial plans were met with criticism, following media's discovery that the main planners had not consulted several hired specialists, and that alternatives to the preferred route had not been made.

As a consequence, several engineers working for the Norwegian State Railways made two alternative suggestion for the route.

[6] In 1978, the city planner discarded the proposal from Oslo Sporveier to build a new station at Slottsparken, and instead decided that Stortinget would become the interchange between the two systems.

These were specified correctly in the tender contracts, but after the contractor was chosen, an agreement was made between the municipality and Selmer for the use of the membrane method.

[12] With the opening of Stortinget, the metro network was declared finished, after the last extension on the Furuset Line to Ellingsrudåsen had been made in 1981.

In 1993, the Sognsvann Line and the Common Tunnel were rebuilt to metro standard, and the first through trains started operating on both sides of Stortinget.