Oslo is the capital of Norway, a city of 724,290 people (1 January 2025) at the head of the Oslofjord in the south-east of the country, with about 1.1 million in its wider urban area. It has been Norway's seat of power since King Haakon V made it his permanent residence around 1300, and for three centuries it carried another name: Christiania, later Kristiania, until the medieval name Oslo was restored in 1925. The quickest way to understand the city is through six buildings, each put up at a turning point in Norway's history, from a royal castle on a rocky point to an opera house that slopes into the fjord.
Akershus Fortress, Haakon V's Stronghold on the Oslofjord
Oslo was already a town before it was a capital. The sagas credit Harald Hardrada with founding it around 1049, but Christian burials dug up in the city predate the year 1000, which is why Oslo celebrated its millennium in 2000. The name itself probably began as the name of a large farm at Bjørvika; linguists read the Old Norse Óslo or Ánslo as either "meadow at the foot of a hill" or "meadow consecrated to the gods", and consider the two equally likely.
What turned the trading town into a capital was a building. In 1287 the nobleman Earl Alv Erlingsson of Sarpsborg attacked Oslo, and it became clear the town's defences were not good enough. Haakon V, who reigned from 1299 to 1319, began a castle on the headland of Akershus in the late 1290s; it is first mentioned in a letter of 1300. Haakon was the first king to live permanently in Oslo, and the city has been regarded as Norway's capital since his reign.
The fortress earned its reputation the hard way. Swedish forces besieged it in 1308, in 1449–1450 and again in 1523, when the townspeople, under Hans Mule, burned their own houses to drive the attackers off. King Christian II besieged it from 1531 to 1532, and Charles XII of Sweden tried in 1716. No foreign army ever took it by siege. Its later lives were less heroic: it has served as a military base and a prison, and today it is the temporary office of Norway's prime minister.
Christiania Torv and the Grid Christian IV Laid Out in 1624
The union with Denmark reduced Oslo to a provincial centre, since the monarchs lived in Copenhagen. Fire kept doing the rest. Built almost entirely of wood, the town burned again and again, and after the fourteenth blaze, which lasted three days in 1624, the Danish-Norwegian king Christian IV decided that the old town would not be rebuilt. His men laid out a new street network on the other side of the bay, directly under the guns of Akershus, and every citizen was ordered to move shops and workplaces there. The new town was named Christiania in the king's honour.
That district survives as Kvadraturen, named for its square blocks, and its centre is the small square of Christiania Torv. On its north side stands Anatomigården, a timber-framed house built in 1640. Nearby, at Nedre Slottsgate 1, is the old City Hall finished in 1641. The medieval site east of the Aker river was never fully abandoned; it lived on as a suburb called Oslo outside the city gates, and when the whole city took back that name on 1 January 1925, the suburb was renamed Gamlebyen, the Old Town, to avoid confusion. Norwegians had argued that a capital of a fully independent country, as Norway became in 1905, should not be named after a Danish king.
Christiania grew slowly for its first hundred years. It was only after the Great Northern War, in the 18th century, that shipbuilding and timber trade turned it into a busy port.
The Royal Palace at the Top of Karl Johans Gate
In 1814 the union with Denmark was dissolved and Norway entered a personal union with Sweden, keeping its own parliament and making Christiania its capital. The new state needed buildings, and the most visible is the Royal Palace. The French-born Charles John, who reigned over Norway and Sweden as Charles III John, chose a site on the western edge of town in 1821 and gave the design to Hans Linstow, a Danish-born officer with little experience as an architect.
It was a slow build. Work began in 1824, and Charles John laid the foundation stone on 1 October 1825. The foundations ran over budget and construction stopped in 1827; the Storting refused more money in protest at the king's efforts to bind his two kingdoms more closely together. Work resumed in 1833 on a cheaper design, the roof went on in 1836, the chapel was consecrated in 1844 and the palace was formally inaugurated in 1849. Charles John died in 1844 without ever living in it.
The palace sits at the upper end of Karl Johans gate, the main street named after him, which runs downhill past the university towards the railway station. Linstow planned the avenue too, with a monumental square halfway down to be ringed by buildings for the university and the parliament, though only the university buildings were realised to his plan. The Bank of Norway (1828), the Stock Exchange (1826–1828) and later the National Theatre (1899) belong to the same building boom that gave the young kingdom its institutions.
The Storting Building at Karl Johans Gate 22
Norway's parliament did not have a home for half a century. The Storting first met in 1814 in a private house at Eidsvoll, then in a school in Christiania, and from 1854 in the great hall of the Royal Frederick University, today the University of Oslo, founded in 1811. A design competition in 1856 was won by Heinrich Ernst Schirmer and Wilhelm von Hanno, but members rejected their scheme because it looked too much like a church. On 18 May 1860 they chose a design by the Swedish architect Emil Victor Langlet instead, by 59 votes to 47.
The cornerstone was laid on 10 October 1861 and members moved in on 5 March 1866. The yellow-brick building is unusual in putting the plenary chamber in the semicircular front section facing the street. It was so large at first that other state agencies shared it, including the Auditor General and the Mapping Authority.
Its hardest years came after the German invasion of 9 April 1940. Parliament fled, meeting once in a cinema in Hamar and once at Elverum Folk High School, and later sat abroad. German troops first used the building as barracks, and then Reichskommissar Josef Terboven moved his administration in. The sinking of the German cruiser Blücher in the Oslofjord that morning delayed the occupation of the city by several hours, long enough for King Haakon VII to escape.
Oslo City Hall, Where the Nobel Peace Prize Is Presented
Becoming a capital made Christiania grow fast. Its population rose from roughly 10,000 in 1814 to about 230,000 in 1900, and in 1850 it overtook Bergen as Norway's largest city. Industry clustered along the Akerselva river, whose waterfalls powered some of the country's first modern factories in the 1840s, and the river became the line between a working-class East End and a wealthier West End. The biggest jump in size came on 1 January 1948, when Oslo merged with Aker, the rural municipality around it, which was 27 times larger. That is why today two-thirds of the municipality is protected forest, hills and lakes, including 343 lakes and 40 islands.
The building that best represents the modern city stands on what used to be the slum district of Vika, facing the harbour at Pipervika. Former mayor Hieronymus Heyerdahl launched a design competition in 1915 after noticing the city had nowhere suitable to receive guests during the 1914 Jubilee Exhibition. Arnstein Arneberg and Magnus Poulsson won in 1918 with a plan inspired by Stockholm's city hall, but money was short. By their final draft of 1930 they had added two office towers, and the foundation stone was laid in September 1931 with King Haakon VII present.
Construction was interrupted by the war and not finished until 1950. The red-brick building has two towers of 63 and 66 metres; the eastern tower holds a carillon of 49 bells, and the bricks, about 27.5 by 13 by 8.5 centimetres, were deliberately made larger than was usual at the time, closer to medieval sizes. It houses the city council and administration, and every December it hosts the ceremony at which the Nobel Peace Prize is presented, the one Nobel prize awarded in Norway rather than Sweden.
The Opera House at Bjørvika, Opened in 2008
The newest landmark stands in Bjørvika, where the farm that probably gave the city its name once lay, on the waterfront east of Akershus. After a long national debate, the Storting voted in 1999 to build a national opera house. The Norwegian firm Snøhetta won against about 350 entries, construction ran from 2003 to 2007, and the building came in 300 million kroner under its budget of 4.4 billion. The gala opening on 12 April 2008 was attended by King Harald, Queen Margrethe II of Denmark and President Tarja Halonen of Finland.
Its idea is simple: the roof is a public space. Clad in white granite and Carrara marble, it slopes down to the level of the fjord, so pedestrians can walk straight up it for views over the city. Inside, the main auditorium seats 1,364 under an oval chandelier of 5,800 handmade crystals. It is the largest cultural building constructed in Norway since Nidaros Cathedral was completed around 1300, the same era in which Haakon V was starting Akershus a short walk away. In its first year, 1.3 million people passed through its doors, and it won the 2009 European Union Prize for Contemporary Architecture.
The opera house was the first piece of a wider redevelopment of the old docks, just as Aker Brygge, built between 1982 and 1998 on the site of the Akers Mekaniske Verksted shipyard, had remade the western waterfront. Together the six buildings trace a line from medieval fortress to modern capital: a castle built against a rival noble, a grid imposed by a Danish king after a fire, a palace for a Swedish-born monarch, a parliament that waited half a century for a home, a city hall that took 19 years to finish, and a marble roof anyone can climb. For the building itself in more detail, see our guide to the Oslo Opera House; for how the Storting and the monarchy share power today, read about the government of Norway; and to see how the capital compares with Bergen, Trondheim and Stavanger, look at our list of the largest cities in Norway.
Quick Facts About Oslo
- Country: Norway
- Continent: Europe (Northern Europe)
- Country population: approximately 5.7 million
- Capital city status: Oslo is the capital of Norway, the seat of national government, and the location of foreign embassies, parliament, and the head of state's official residence.
Frequently Asked Questions
What is the capital of Norway?
The capital of Norway is Oslo. Oslo is the seat of national government, hosts most foreign embassies and consulates, and is typically where the head of state and parliament are located.
What continent is Oslo in?
Oslo, the capital of Norway, is located in Europe, in the Northern Europe region. As Norway's capital, Oslo serves as the country's primary connection to the broader Europen political, economic, and cultural sphere.
Why is Oslo the capital of Norway?
Oslo was chosen as the capital of Norway for reasons that typically combine geography, history, and politics. Capital city selections often reflect a desire for centrality (being accessible from across the country), historical importance (being a longstanding seat of government or culture), or neutrality (being acceptable to multiple regions or ethnic groups within the country). The specific reasons for Oslo's designation are detailed in the city's history above.
What is Oslo known for?
As the capital of Norway, Oslo is best known for housing the country's central government institutions — parliament, presidential or royal residences, supreme court, and key ministries. It is also typically a major cultural and economic center within Norway, hosting national museums, embassies, and signature monuments. The introduction and history sections above provide detailed coverage of the city's specific notable institutions and landmarks.
Related Pages
- Norway Country Guide — full geography, climate, economy, and culture overview
- Flag of Norway — meaning, history, and design of Norway's national flag