Coordinates: 67°00′S 20°00′E / 67°S 20°E / -67; 20

King Haakon VII Sea (Norwegian: Kong Haakon VII Hav) is an arm of the Southern Ocean on the coast of East Antarctica.

From the international point of view, King Haakon VII Sea lies between Weddell Sea and Lazarev Sea, and thus stretches only along Kronprinsesse Märtha Kyst from Cape Norvegia at 12°18'W, the easternmost point of the Weddell Sea, to Fimbul Ice Shelf close to the Prime Meridian at 0°0', which is recognized as the western border of Lazarev Sea.^{[citation needed]}

From the Norwegian point of view, which does not recognize Lazarev Sea, King Haakon VII Sea is situated along the entire coast of Dronning Maud Land between 20°W and 45°E and stretches for about 10 090 km (6 270 miles) from the Stancomb-Wills Glacier at 19°W on Kronprinsesse Märtha Kyst in the west to Shinnan Glacier at 44°38'E on the eastern border of Kronprins Olav Kyst in the east.

The sea covered by ice most of the year. During autum Pack ice forms which does not break up until spring. The rough coordinates of the sea area are 67°00′S 20°00′E / 67°S 20°E / -67; 20.

Haakon VII (Prince Carl of Denmark and Iceland, born Christian Frederik Carl Georg Valdemar Axel) (3 August 1872 – 21 September 1957), known as Prince Carl of Denmark until 1905, was the first king of Norway after the 1905 dissolution of the personal union with Sweden. He was a member of the House of Schleswig-Holstein-Sonderburg-Glücksburg. As one of the few elected monarchs, Haakon quickly won the respect and affection of his people and played a pivotal role in uniting the Norwegian nation in its resistance to the attack and five-year-long Nazi occupation during World War II.

In Norway, Haakon is regarded as one of the greatest Norwegians of the twentieth century and is particularly revered for his courage during the German invasion—he threatened abdication if the government cooperated with the invading Germans—and for his leadership and preservation of Norwegian unity during the Nazi occupation. He died at the age of 85 on 21 September 1957, after having reigned for nearly 52 years.

Originally known as Prince Carl of Denmark (namesake of his maternal grandfather the King of Norway etc.), he was the second son of (the future) King Frederick VIII of Denmark and his wife Louise. Furthermore, he was a younger brother of Christian X, a paternal grandson of King Christian IX of Denmark (during whose reign he was prince of Denmark), and a maternal grandson of King Charles XV of Sweden (who was also king of Norway as Charles IV). He became king of Norway before his father and older brother became kings of Denmark. During his reign, he saw his father, his brother and his nephew, Frederick IX, ascend the throne of Denmark, respectively in 1906, 1912 and 1947.