The Church Union is an Anglo-Catholic advocacy group within the Church of England.
The organisation was founded as the Church of England Protection Society on May 12, 1859 to challenge the authority of the English civil courts to determine questions of doctrine. It changed its name to the English Church Union in May 1860 and was active in defending Anglo-Catholic priests such as Arthur Tooth, Sidney Faithorn Green and Richard William Enraght against legal action brought under the Public Worship Regulation Act 1874. In 1933 it merged with the Anglo-Catholic Congress to form the present organisation.