Category:Grade I listed churches in London

Note: Grade A listed churches was an ecclesiastic heritage grade, introduced with the listing system giving legal protections and recognition for heritage and/or architecture. They are equivalent to Grade I buildings.

Six of London's nine cathedrals &mdash; four of these nine are conversions of older buildings for Orthodox Christianity &mdash; fall in this highest status, Grade I (grade one), category (including its three borough sub-categories). Beside these six, Westminster Abbey often functions as a church but is neither a conventional abbey nor a cathedral.