Day of the Heroes of the Carpathian-Duklian Operation is a significant day in Slovakia, observed on September 8 every year. This day is dedicated to honoring the heroes who fought and lost their lives in the Carpathian-Dukla Operation during World War II.

The Carpathian-Dukla Operation was one of the most brutal and deadly battles fought on Slovak territory between September and November 1944. It involved Soviet, Czechoslovak and German troops, with an estimated casualties of over 130,000 soldiers.

On this day, Slovaks commemorate these heroes by participating in memorial services across the country. The main event is held at the Dukla Pass War Memorial where representatives from both Slovakia and neighbouring countries gather to pay tribute to those who fell during this operation. The commemoration includes laying wreaths at memorials, military parades, speeches by officials and veterans, as well as educational activities designed to inform younger generations about this significant historical event.

Families often visit war memorials or cemeteries where their loved ones are buried. Schools also participate by teaching students about the historical event on this day. Some communities host reenactments of key moments from the war or organize exhibitions showcasing artefacts and narratives from that time.

The Day of the Heroes of the Carpathian-Duklian Operation serves as a reminder of Slovakia's turbulent past during World War II and stands as a testament to national resilience and unity in times of adversity.