Prince William led senior European royals in mourning at the state funeral of King Harald V of Norway, held at Oslo Cathedral. William represented his father, King Charles, in line with royal precedent that the sovereign does not attend the funerals of other heads of state, while Princess Anne attended in a personal capacity as godmother to the new monarch, King Haakon VIII. The occasion also drew scrutiny because Marius Borg Hoiby, the stepson of the new king and currently serving a prison sentence under house arrest for rape convictions, was temporarily released to attend, prompting criticism from some royal watchers.

The funeral saw a 21-gun salute and a procession from the Royal Palace to Oslo Cathedral, with thousands lining the streets and screens set up nationwide for the public to watch. Attendees included King Felipe of Spain, King Frederik and Queen Mary of Denmark, King Carl XVI Gustaf and Queen Silvia of Sweden, Princess Charlene of Monaco, the Dutch royal family, and Ukrainian President Volodymyr Zelenskyy. Harald, who reigned for 35 years and was a second cousin of the late Queen Elizabeth II, was survived by his widow Queen Sonja, while his son Haakon has now acceded to the throne alongside heir Crown Princess Ingrid Alexandra.