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The 'Oslofjord' (Norwegian: ''Oslofjorden'') is a bay in the south-east of Norway, stretching from Langesund in the south to Oslo at the head. The bay is divided into the inner (''indre'') and outer (''ytre'') Oslofjord at the point of the 17 km long and narrow Drøbaksundet. The entire population situated around the Oslofjord including Oslo is about 1.7 million.
In spite of its name, the Oslofjord is not, geologically speaking, a fjord. In historical times, it was known as Viken (''the bay''); it is unclear when (and for what reason) it acquired its current name.
Norwegian painter Edvard Munch had a cottage and studio in Åsgårdstrand on the fjord and it appears in several of his paintings, including ''The Scream'' and ''Girls on the Pier''.



The fjord was the scene of a key event in the German invasion of Norway in 1940. The invasion included a planned landing of 1,000 troops transported by ship to Oslo. Colonel Eriksen, Commander of the Oscarsborg fortress near Drøbak, mainly maintained for historical purposes, sank the German heavy cruiser ''Blücher'' in the Drøbak narrows.
The fortress' resistance blocked the route to Oslo, thus delaying the rest of the group long enough for the royal family, the government and parliament to be evacuated, as well as the national treasury. The result was that Norway never surrendered to the Germans, leaving the Quisling government illegitimate and permitting Norway to participate as an ally in the war, rather than as a conquered nation.
The Oslofjord is one of the nine venues of the Class 1 World Powerboat Championship.