The Spiritual Exercises of St. Ignatius of Loyola, (composed from 1522-1524) are a set of Christian meditations, prayers and mental exercises, divided into four thematic 'weeks' of variable length, designed to be carried out over a period of 28 to 30 days. They were composed with the intention of helping the retreatant to discern Jesus in his life, leading then to a personal commitment to follow it. 

Though the underlying spiritual outlook is Catholic, the exercises are often made nowadays by non-Catholics. The 'Spiritual Exercises' booklet was formally approved in 1548 by Paul III.

To this day, the Spiritual Exercises remain an integral part of the Novitiate training period of the Roman Catholic religious order of Jesuits. Also, many local Jesuit outreach programs throughout the world offer retreats for the general public in which the Exercises are employed.