The birthday of King Frederik X of Denmark is observed in Denmark every May 26. Although it is not a public holiday, it is one of the official flag-flying days in the country. The king typically makes a public appearance on his birthday, continuing a tradition that began when he became Crown Prince in 1972. Following his accession to the throne in 2024, the celebrations have included more fanfare, with the royal family appearing on the balcony of either the Marseliborg Palace or one of the palaces in Amalienborg. The Royal Life Guard performs a grand changing of the guard ceremony on the palace square, adding to the day's significance. King Frederik was born on May 26, 1968, and has a strong interest in climate change, sustainability, and sports, reflecting his active role in Danish society.