María Bernarda Bütler, born Verena Bütler, was a Swiss religious sister. She founded the Franciscan Missionary Sisters of Mary Help of Sinners and served in the missions in Ecuador and Colombia. Bütler worked for the care of the poor in these places until her exile from Ecuador and entrance into Colombia where she worked for the remainder of her life. The congregation moved there with her, and continued to expand during her time there until her death.