Joaquín Sáenz y Arriaga (Joaquín Sáenz Arriaga; 12 October 1899 – 28 April 1976) was a Mexican Catholic priest and theologian. Jesuit from 1916 to 1952 he was later a harsh critic of the Second Vatican Council decisions and of the post-conciliar Pope Paul VI. In 1972, he was declared excommunicated by the Roman Catholic bishops' conference of Mexico. He is considered as the promoter of the sedevacantist ideas.