St Faith under St Paul's in Castle Baynard Ward was an unusual parish within the City of London. It originally had its own building to the east of St Paul's Cathedral, serving as a parish church for the residents of St Paul's Churchyard and Paternoster Row, but this was removed in 1256 to allow for the eastern expansion of the Cathedral. The parishioners were instead given a space to worship within the cathedral crypt. 
|St Faith under St Paul's|
|Location||Castle Baynard, London|
|Years built||Pre 11th century|
Until the reign of Edward VI the parishioners worshipped at the end of the west crypt under St Paul’s Quire. Sir Simonds D'Ewes, the diarist, attended the wedding of his father Paul and his stepmother, Lady Elizabeth Denton, in "St. Faith's under St. Paul's" on 5 March 1623, and Sir Simonds's younger sister Mary also married there on 4 December 1626 From the reign of Edward VI until the Great Fire the parishioners, mostly booksellers in Paternoster Row, transferred to the Jesus Chapel, their separateness emphasised by a screen.
- On St Paul's Cathedral School in New Change
- The parish also extended into Farringdon Within: Borer, M. I. C. (1978). The City of London: a history. New York: D. McKay Co. ISBN 0-09-461880-1.
- Christopher, Ben; Hibbert, Weinreb (1983). The London Encyclopaedia. London: Macmillan. pp. 706–707. ISBN 0333325567.
- Harbens, H. A (1918). A Dictionary of London: being notes topographical and historical relating to the streets and principal buildings in the City of London. London: Herbert Jenkins.
- Plea Rolls of the Court of Common Pleas; National Archives; CP 40/483; year 1381, Term 4; http://aalt.law.uh.edu/AALT6/R2/CP40no483/483_0233.htm; 6th entry, William Phelip, brother & heir of John Phelip, formerly parson of St Faith, etc.
- Huelin, G. (1996). Vanished Churches of the City of London. London: Guildhall Library Publishing. ISBN 0-900422-42-4.
- "The Autobiography and Correspondence of Sir Simonds D'Ewes," London, 1845, vol. 1, pp. 229, 324.
- Diary of Samuel Pepys, Dover, Lewis Publications, 1992 ISBN 978-0-486-43667-8
- A Survey of London, Vol I Stow, J. (Originally, 1598: this edn-London, A. Fullarton & Co, 1890)
- The tombs, monuments, etc., visible in S. Paul's Cathedral (and S. Faith's beneath it) previous to its destruction by fire A.D. 1666 Major Payne Fisher (Blacker Morgan, G.B. Ed., 1855): London, Privately printed, 1684.
- "The Churches of the City of London" Reynolds,H.: London, Bodley Head, 1922