Constitution Day is a national holiday in the Principality of Andorra, celebrated annually on March 14. This day memorializes the adoption of the Andorran Constitution which was approved through a referendum on March 14, 1993. Before this, Andorra was the last surviving Feudal state in Europe with codified laws and regulations that were largely informal and customary.

The day is marked with various celebrations, including parades, fireworks, gatherings, and political speeches. Schools and businesses largely close for the day, allowing citizens to focus on the festivities and reflect on the importance of their Constitution. Important figures in the community, such as the country's Co-Princes - the President of France and the Bishop of Urgell in Spain, often partake in the celebrations and express messages of unity, prosperity, and progress - fundamental principles in the Andorran Constitution.

Constitution Day is an important day for the citizens of Andorra, as it represents the establishment of democracy and rule of law in a state that was otherwise governed by feudal principles. It is the reinforcement of the rights and obligations of the Andorran people, and of the political, social, and economic structures of the country. Every year, this commemoration of the Constitution aims to strengthen the democratic values of the Andorran society and serves as a reminder of the country's journey towards social and political stability and independence.