His death was announced with a statement from the Norwegian Palace, which read: "It is with deep sorrow that we announce that His Majesty King Harald passed away today. King Harald passed away peacefully at Rikshospitalet on Friday, August 28, at 06:35."
His son, Crown Prince Haakon, will now become King Haakon VIII.
Harald became King following his father King Olav's death in 1991, and in 2016 he celebrated his Silver Jubilee.
Born on 21 February 1937 to Olav V of Norway and Princess Martha of Sweden, Harald became Crown Prince at the age of 20, upon his grandfather Haakon VII's death in 1957.
Harald shared a close bond with many of the European monarchs, including the late Queen Elizabeth II. Elizabeth was a second cousin to Harald and the pair shared the same great-grandparents, King Edward VII and Queen Alexandra, who were the father and mother of Norway's own Queen Maud.
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He represented Norway in sailing at three consecutive Olympic Games from 1964 and took a stand over objections to his romance with commoner Sonja Haraldsen.
Despite having two older sisters, it was always Harald who was destined to get the throne. Here, the royal, then aged 13, is seen standing underneath a portrait of his grandfather, Kaakon VII.
A keen sailor, Harald represented Norway at three Olympic Games, competing between 1964 and 1972. Although his best position was sixth, when he made his Olympic debut, he was the flagbearer for the Norwegian athletes.
The then Prince Harald with wife Sonja on their wedding day in 1968.
Sonja wore a silk wedding gown by Norwegian department store, Molstad and sported flowers in her hair instead of a tiara to secure her veil.
The couple had dated for nine years but there was controversy over their romance, as Sonja was a commoner.
Harald told his father Olav that if he was not allowed to marry Sonja he would not marry at all. This would have been a disaster as it would have ended the reign of his family and the Norwegian monarchy, as Harald was the sole heir to the throne.
Harald and Sonja welcomed their first child, Princess Martha Louise, on 22 September 1971.
Although Martha Louise is two years older than her brother, King Haakon, she did not feature in the order of succession at the time of her birth, because constitutional law at the time dictated that only males could inherit the Norwegian throne.
The law changed in 1990 but only applied to those born that year or later.
Females born between 1971 and 1990 were given succession rights but their brothers would still be before them in the line of succession.
Princess Martha Louise shares three daughters with her late husband, Ari Behn, (who died by suicide in 2019) – Maud, Leah and Emma.
Harald became King of Norway following the death of his father, King Olav V, on 17 January 1991. The new monarch is seen here leading his father's funeral, which was held 13 days after he passed.
The palace also released a portrait of the King with his two heirs, the then-Crown Prince Haakon and Princess Ingrid Alexandra, to mark his Silver Jubilee in 2016.
Princess Ingrid Alexandra is now first in line to Norway's throne and is expected to become the country's second female monarch, after the 15th-century Queen Margaret.
Harald's last public appearance before his death came on 22 July 2026. The late monarch headed to Oslo Cathedral to mark the 15th anniversary of the 2011 Norway terrorist attacks, which killed a total of 77 people.
King Harald was taken to the National Hospital in Oslo last week with haemolytic anaemia, with the Norwegian palace giving an urgent update on his health on Sunday
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