The Order of the Brothers of Our Lady of Mount Carmel or Carmelites (sometimes simply Carmel by synecdoche; Latin: Ordo Fratrum Beatissimæ Virginis Mariæ de Monte Carmelo) is a Roman Catholic religious order founded, probably in the 12th century, on Mount Carmel, hence its name. However, historical records about its origin remain uncertain.Saint Bertold has traditionally been associated with the founding of the order, but few clear records of early Carmelite history have survived and this is likely to be a later extrapolation by hagiographers.

The charism, or spiritual focus, of the Carmelite Order is contemplative prayer. The Order is considered by the Church to be under the special protection of the Blessed Virgin Mary and thus has a strong Marian devotion. As in most of the orders dating to medieval times, the First Order is the friars (who are active/contemplative), the Second Order is the nuns (who are cloistered) and the Third Order consists of laypeople who continue to live in the world, and can be married, but participate in the charism of the order by liturgical prayers, apostolates, and contemplative prayer. There are also offshoots such as active Carmelite sisters.