Union of Catholic Apostolate is a Catholic association established by a Roman priest St. Vincent Pallotti in 1835.
On January 9, 1835 Father Vincent Pallotti founding the Union of Catholic Apostolate expresses his idea in the following words: "The Catholic Apostolate, that is the universal apostolate, which is common to all classes of people, consists in doing all that one must and can do for the greater glory of God and for one’s own salvation and that of one’s neighbor."On July 11 of the same year, Pope Gregory XVI gave his approval.
A characteristic feature of the Union is the equality of rights and duties of all its members, be it religious, ordained or the lay faithful. All exercise the apostolate of Jesus Christ in the Church and in the world. What differentiates the members is the variety of vocations and callings they live.
The Union was officially recognised by the Pontifical Council for the Laity as an international association of the Catholic Church on 28 October 2003. Its Statutes were then approved provisionally (ad experimentum) for the period of five years and then definitively approved on 28 October 2008. The first President of the General Coordination Council of the UAC was Mons. Seamus Freeman. As of 2016[update] the President was Fr. Jeremiah Murphy, S.A.C.
The UAC is active in 45 countries on six continents.
The group lives on at Saint Vincent Pallotti High school in Laurel, Maryland. The Union are student leaders, also called Union Leaders, selected to be the leaders of school retreats, religious clubs, and more.