The court said the princess died peacefully, surrounded by her family, at her home, Koberg Castle, in Västergötland.
"It is with great sadness that I have received the information that my sister, Princess Désirée, has passed away," said King Carl XVI Gustaf in a statement.
"Many are the warm family memories that have been created at the Silfverschiöld family home in Västergötland - a place in Sweden that came to mean a lot to my sister."
Princess Désirée, Baroness Silfverschiöld, was 87. She is survived by three children and their families.
She had been in poor health for the last five years, so it was not a completely unexpected death, said royal expert Roger Lundgren.
Reserved sister
He described the princess, the third of the Haga siblings, as a shy and withdrawn person.
She felt most comfortable in the quiet corner of her home and since she married Niclas Silfverschiöld in the 1960s, she had hardly carried out any official duties.
However, her relationship with the king and the rest of the family was warm and close, according to Roger Lundgren.
"She was a beloved sister of the king and a much-loved godmother to the Crown Princess. They often visited Koberg," said Roger Lundgren.
End of an era
On the occasion of Princess Désirée's passing, the King has ordered flags to be flown at half-mast at Drottningholm Palace and Haga Palace.
The King's second-eldest sister, Princess Birgitta, died in 2024. Princess Margaretha, who is the eldest of the siblings, is 91 and also leads a secluded life in the United Kingdom.
It's not surprising that this era ends when you're in your 90s, but it's always difficult to lose family members regardless of age, said Roger Lundgren.
