Tiburcio Arnaiz Muñoz (11 August 1865 - 18 July 1926) was a Spanish Roman Catholic priest and a professed member of the Jesuits. He was also the co-founder of the Missionaries of the Rural Parishes (1922) and decided to establish it to further his own pastoral goals of aiding the poor with a particular emphasis on workers and people living in those rural areas across the nation. His ecclesial career was spent in two parishes for just over a decade, before he entered the Jesuit novitiate. He became known for his tender care of all people.