El Niño Fidencio (October 17, 1898 – October 19, 1938) was a Mexican curandero. His birth name was José de Jesús Fidencio Constantino Síntora. Today he is revered by the Fidencista Christian Church. The Catholic Church does not recognize his official status as a saint, but his following has extended through the northern part of Mexico and the southwest of United States. This situation allows El Niño Fidencio to be recognized as a folk saint.
While in elementary school, he met Father Segura, as well as Enrique López de la Fuente, who was the janitor as well as his friend, and later, his protector. They both worked to help the priest with religious services, and it was at this time that Fidencio learned to work with herbs and how to cure.