St Martin, Ludgate, also known as St Martin within Ludgate, is an Anglican church on Ludgate Hill in the ward of Farringdon, in the City of London. The church is of medieval origin, but the present building dates from 1677 to 1684 and was designed by Sir Christopher Wren.

Ludgate Hill is a street and surrounding area, on a small hill in the City of London, England. The street passes through the former site of Ludgate, a city gate that was demolished – along with a gaol attached to it – in 1760.