Resistance Day, known as 'dan upora proti okupatorju' in Slovenian, is a national holiday in Slovenia that occurs on April 27th each year. The holiday commemorates the establishment of the Slovene Liberation Front, also known as the Slovene Partisan resistance movement, during World War II. This significant event took place on April 27, 1941, in the capital city of Ljubljana, barely two weeks after Slovenia was occupied by Nazi Germany.

The Slovene Liberation Front played a crucial role in fighting against the oppressive occupation. They orchestrated a successful and intensive guerrilla war against the Axis powers, demonstrating tremendous courage and an unwavering resolve for freedom. Resistance Day is not just a commemoration of the formation of this important group, but a celebration of the distinct will of the Slovenian people to resist external encroachment and oppressive rule.

On Resistance Day, events are held throughout Slovenia to honor the heroes who fought for the country's freedom and sovereignty. The day is marked with speeches by prominent national figures, wreath-laying ceremonies at monuments dedicated to the Slovene Liberation Front, and other commemorative events. The holiday serves as a reminder of the country's defiant stand during a dark period in history, and of the ideological strength and determination of its people.