Mateo Elías Nieves Castillo (21 September 1882 – 10 March 1928) was a Mexican Roman Catholic priest who was also a member of the Order of Saint Augustine who assumed the name of Elias del Socorro when he became a member of the order. Pope John Paul II beatified him on 12 October 1997 without a miracle because he was killed "in odium fidei" and therefore did not require a miracle. Instead it was proved that he was killed in hatred of the faith. A miracle is now under investigation for prospective sainthood.