Regnum Christi is a lay Movement within the Catholic Church whose particular charism is the formation of lay apostles for the purpose of evangelization.​​  

Its Christ-centered spirituality gives its members an ever-deeper love for Jesus with the help of daily meditation, periodic retreats and spiritual direction as well as a missionary zeal to help souls and build the Church. 

The Legionaries of Christ are the religious order of priests who share the same spirituality and mission.