| St Gregory by St Paul's | |
|---|---|
 The west end of Old St Paul's Cathedral, with St Gregory's against the south-west tower. | |
 | |
| Location | Castle Baynard, London |
| Country | United Kingdom |
| Denomination | Anglican |
| Architecture | |
| Demolished | 1666 |
St Gregory's by St Paul's was a parish church in the Castle Baynard ward of the City of London, built against the south-west tower of St Paul's Cathedral. It was destroyed in the Great Fire of London in 1666 and not replaced.