The Legion of Mary is a lay apostolic association of Catholics who, with the sanction of the Church and under the powerful leadership of Mary Immaculate, Mediatrix of All Graces, serve the Church and their neighbour on a voluntary basis in about 170 countries.

With the approval and support of the Popes and a great many Bishops, Priests and Religious, as well as the prayers and efforts of legionaries, the Legion, by the grace of God, has grown into a worldwide organisation with several million members.

The Legion aims to bring Mary to the world as the infallible means of winning the world to Jesus and legionary service is based on the doctrine of the Mystical Body of Christ so that in their fellow members an in those they serve, legionaries seek to have the Person of our Lord once again seen and served by Mary, his Mother.