King Father Norodom Sihanouk Memorial Day is a significant national holiday in Cambodia, held every year on October 15. This annual public holiday is devoted to remembering Norodom Sihanouk, the late King Father of Cambodia, who passed away from heart failure on October 15, 2012. Sihanouk was a central figure in the Cambodian political landscape, having led the nation as King and Prime Minister at different times from 1941 until his retirement in 2004.

The holiday first started in 2013, a year after the King Father's demise, as a mark of respect and honour for the indispensable services he rendered to the nation. On this day, commemorations and solemn ceremonies are held across the country, especially at the Royal Palace in Phnom Penh. As the nation pauses in remembrance, thousands of Cambodians offer prayers and pay their respects to the late King Father, who is revered as a symbol of continuity and unity.

King Father Norodom Sihanouk Memorial Day is not only a day of mourning but also a day of national unity, reflecting on the historical milestones that the country has undergone. This day also serves as a reminder of Norodom Sihanouk's legacy - his significant role in gaining independence for Cambodia from French rule and his tireless efforts towards peace and prosperity in the post-independence era. Every year on this day, the Cambodian people honour this remarkable man, focusing on his dedication and determination that played a crucial role in shaping the country.