Our Lady of Mercy Day is observed every year on September 24. The day honors Mary under the title of Our Lady of Mercy, a devotion that has deep roots in Catholic tradition. In Spain, especially in Barcelona, she is known as La Mercè, the patron saint of the city. The occasion is marked with large celebrations, including church ceremonies, parades, music, and cultural events that blend faith with local traditions.

Beyond Spain, the devotion also holds great importance in Latin America. In the Dominican Republic she is venerated as Nuestra Señora de las Mercedes, recognized as the country’s patron saint. On September 24, pilgrims travel to the sanctuary at Santo Cerro, and nationwide masses and processions take place. In Peru she is honored as the patroness of the armed forces, with special services and military tributes. In Argentina, her feast is observed in various regions where churches are dedicated in her name.

Together these celebrations highlight how one devotion, centered on mercy and protection, has traveled across continents. The day reflects both local culture and shared faith, making September 24 a significant date in Catholic calendars around the world.