The Anglican Diocese of London forms part of the Province of Canterbury in England.
Historically the diocese covered a large area north of the River Thames which included all of Essex and southern and Eastern parts of Hertfordshire, and bordered the dioceses of Norwich and Lincoln to the north and west.
The present diocese covers 177 square miles (458 km2), and 17 London boroughs, covering most of Greater London north of the Thames and west of the River Lea.
This area corresponds almost exactly to the historic county of Middlesex (except the South Mimms and Potters Bar area), and includes the City of London in which lies its cathedral, St Paul's, as well as encompassing Spelthorne, which is currently administered by Surrey.
[1] In the following tables APC stands for ancient parish church and MC for medieval chapel.