All Saints' Day, known also as All Hallows' Day, Hallowmas, or Feast of All Saints is observed with high reverence in the country of San Marino. This Christian holiday is dedicated to the recognition and celebration of all the saintly figures recognized in the Christian faith, whether they are known or unknown. Celebrated each year on November 1st, the day is public holiday in San Marino, respecting and appreciating not just the known saints, but all individuals who have reached heaven after their time on earth.

The celebrations are often marked by public and private prayers, religious observances, and church services. Many people also visit the graves of their loved ones, leaving flowers and lighting candles in their memory, a custom widely practiced in San Marino. In some instances, families also celebrate by having large feasts. The significance of this day is even inserted into the country’s fabric, indicative of San Marino's deep rooted Catholic faith.

In San Marino, All Saints' Day is also seen as a day to strengthen the bond within families, express love and respect for those departed and to teach younger generations about the concept of life and death, and the idea of sainthood in Christianity. The holiday is also noteworthy as it falls on the day after Halloween, providing a spiritual and introspective counter to the fun and frolic of Halloween celebrations. The people of San Marino use the day to uplift their spiritual energy, celebrating life through the memory of those who have passed.