Grand Duke's Official Birthday (Luxembourg)

The Grand Duke's Official Birthday, also known as Luxembourgish National Day, is celebrated as the annual national holiday of Luxembourg. It is celebrated on 23 June, although this has never been the actual birthday of any ruler of Luxembourg. When the monarch of Luxembourg is female, it is known as the Grand Duchess's Official Birthday.

Luxembourg, officially the Grand Duchy of Luxembourg, is a landlocked country in Western Europe. It is bordered by Belgium to the west and north, Germany to the east, and France on the south. Its capital and most populous city, Luxembourg City, is one of the four institutional seats of the European Union and hosts several EU institutions, notably the Court of Justice of the European Union, the highest judicial authority in the EU.