Teresa of Ávila, OCD, also called Saint Teresa of Jesus, was a Carmelite nun and prominent Spanish mystic and religious reformer.

The Discalced Carmelites, known officially as the Order of the Discalced Brothers of the Blessed Virgin Mary of Mount Carmel or the Order of Discalced Carmelites, is a Catholic mendicant order with roots in the eremitic tradition of the Desert Fathers. The order was established in the 16th century, pursuant to the reform of the Carmelite Order by two Spanish saints, Teresa of Ávila (foundress) and John of the Cross (co-founder). Discalced is derived from Latin, meaning "without shoes".