Parish of Christ Church, Marylebone , Church of England

Christ Church, Cosway Street was founded in 1825 as one of the four district rectories established by Act of Parliament within the parish of St Marylebone. St John's Wood Chapel (P89/JN1) which had been built in 1814 as a chapel of ease to Saint Marylebone parish church (P89/MRY1) became in 1898 a chapel of ease to Christ Church, Cosway Street, served by its own minister until the 1920s. The Rector of Christ Church, the Reverend T. G. Brierley Kay moved from Christ Church House into St John's House in 1932 and increasingly the parish appears to have been administered from St John's House. His successor, the Reverend O. H. Gibbs-Smith, appointed Rector of Christ Church in June 1941, was also in charge of the parishes of Saint Barnabas, Bell Street (P89/BAN) and Saint Stephen, Avenue Road, with Saint Andrew, Allitsen Road.

The scheme for the parochial reorganisation of Marylebone published in 1945 proposed that the parish of Christ Church should be united with Saint Barnabas, Bell Street while it would lose St John's Wood Chapel which was to become the new parish church of what was essentially the former parish of Saint Stephen, Avenue Road. Although this scheme was not legally implemented until 1952, it came into force defacto at the beginning of 1948 when, on the resignation of the Reverend O. H. Gibbs-Smith, separate incumbents were appointed for the parishes of Christ Church with Saint Barnabas, and Saint Stephen with Saint John. On 1 January 1948 the Christ Church balances were separated from the Saint John's balances and a new ledger was opened for Christ Church, while Saint Stephen's with Saint John continued to use the former Christ Church ledger.

The parish of Christ Church was united with Saint Paul, Rossmore Road (P89/PAU2) in 1971 to form the parish of Christ Church and Saint Paul, St Marylebone. Both churches became parish churches of the new parish until Christ Church was declared redundant in January 1977. The parish was united with Saint Mark with Saint Luke, Marylebone (P89/MRK1) in July 1978 and a team ministry was established. Saint Mark's Church is the parish church of the united parish which is known as the parish of Christ Church, St Marylebone.