Assumption Day, also known as the Feast of the Assumption, is a significant holiday in Slovenia. It is recognized every year on the fifteenth of August. The holiday is deeply rooted in religious beliefs, specifically those of the Catholic Church, which hold a sizable following in Slovenia. Assumption Day commemorates the belief in the Virgin Mary's bodily ascent to heaven upon her death.

The celebration of this day in Slovenia is often marked with special church services and religious processions. Many towns and villages throughout the country participate fully in this holiday, including traditional and cultural practices, which correlate with the rich Slovenian history. These include events like folk dances and music performances. Most businesses are closed on this day to allow for full participation in the activities of Assumption Day.

In addition, Assumption Day in Slovenia is closely associated with blessing the harvest and fruit. Many Slovenians traditionally take their produce to church to be blessed on this day. It is not just a religious festival, but also a social event and an agricultural celebration. It is one of the public holidays in Slovenia, enforcing the significance of religion and tradition in the country. It is a day of joy and festivities that brings families and communities closer, helping to preserve and perpetuate the rich Slovenian cultural heritage.