Mariano de la Mata was a 20th-century Spanish Catholic priest and Augustinian missionary who dedicated his life to service in Brazil. Born in La Puebla de Valdavia in 1905, he joined the Order of Saint Augustine and later moved to Brazil in 1931 to support the mission there. He was highly regarded for his commitment to the poor, particularly through his extensive educational initiatives and his tireless visits to the sick. Despite facing declining health and vision in his later years, he remained an active presence in his community until his death in 1983.