Assumption Day, also known as The Feast of the Assumption of Mary, is a significant public holiday in Croatia. It is a religious observance celebrated on August 15 every year. The day is dedicated to honor the belief in the Orthodox, Catholic, and some Protestant churches that Mary, the mother of Jesus Christ was physically taken up into heaven at the end of her earthly life. This event is known as the 'Assumption of Mary' and is considered one of the most important Marian feasts.

Assumption Day in Croatia is marked with great zeal and enthusiasm. Special church services, including, the holy mass, processions, and assorted religious rituals take on prominence. Families attend these services, showcasing their faith and devotion. It is also an opportunity for Croatians to spend time with their families, highlighting the strong cultural emphasis on family ties within the country. In some coastal towns, this day is also accompanied by boat processions and blessing of the sea, which is both a spectacular sight and a testament to Croatia's rich maritime heritage.

The festivities of Assumption Day extend beyond religious observances. Croatians enjoy the day off work, spending it relaxing or participating in leisure activities. Many use this holiday as a chance to go on a brief vacation, heading to the coast or the country's beautiful islands. Traditional food and drinks are part of the celebration, showcasing the culinary diversity of the country. In some regions, the holiday is also accompanied by local fairs and festivals, offering people an opportunity to enjoy traditional music, dance, and other cultural experiences.