Distrito Federal Foundation Day is a unique holiday celebrated in Brazil, specifically in the Federal District, which is known as Distrito Federal in Portuguese. This day is dedicated to marking the founding of the Federal District, which is unique in the country as it is not part of any Brazilian state but instead serves as the location of the national capital, Brasília.

This important holiday is a testament to the unique status of the Federal District within the Brazilian federal structure, and it commemorates the area's establishment on April 21, 1960. On Distrito Federal Foundation Day, government offices, schools, and many businesses are closed, providing residents with a break from their normal routines. Many use this time to participate in local events and celebrations which are held across the district.

The day also serves as a time to reflect on the history of Brasília which was built in the late 1950s to serve as the new federal capital, replacing Rio de Janeiro. The day is filled with various cultural activities including concerts, food festivals, recreational sports, and other communal activities. It’s a day of unity and pride for the people in the Federal District, and the celebrations provide a vibrant reminder of their distinct place within Brazil's political and geographic landscape.