The Order of Corporate Reunion (OCR) is an ecumenical association of clergy and laity of Anglican origin. The order was founded in London in 1874 by Frederick George Lee, Thomas Mossman and John Thomas Seccombe. It is an Anglo-Papalist society, founded to continue the work of the Association for the Promotion of the Unity of Christendom (APUC) and to restore an apostolic succession recognised by the Roman Catholic Church through reordinations as a means for reunion. The order affirms and supports what is Catholic in Anglicanism and in other Christian churches. It encourages work and prayer for Christian unity, especially the Week of Prayer for Christian Unity celebrated from January 18 to 25.
The three founders each claimed to have been consecrated a bishop by an existing bishop standing in a recognised apostolic succession from the original apostles of the first century of the Christian era. However, they did not state in public the names of the bishops who had consecrated them. Now, nearly 150 years afterwards, there are claims on the Internet as to who the original consecrating bishops were. However, the veracity of these claims are disputed.
The Order of Corporate Reunion regards valid apostolic succession as an essential aspect of the church Catholic. It preserves and protects its own apostolic succession.
Following the deaths of its three founders, the order fell dormant. The episcopal succession, however, had been maintained, and in 1912 the order was revived.
Prominent members and leaders during the 20th century of the revived order included Arnold Harris Mathew, Arthur Wolfort Brooks and Hugh George de Willmott Newman.
The holy orders of the Church of England and of the other Anglican Communion churches had been declared by the Roman Catholic Church to be "absolutely null and utterly void". Some other scholars and commentators also questioned the validity of Anglican orders. During the first half of the 20th century, numerous serving Anglican clergy therefore sought and obtained ordination by OCR bishops as a conditional ordination (reordination), with the aim of receiving holy orders which they could regard as valid, or that others would regard as valid, or of in some way bolstering or improving their claim to be validly ordained. Most of these OCR ordinations took place in secret, though information about some of them became public. It is claimed that some who became very prominent leaders within the Church of England received OCR ordination in addition to their Anglican ordination.