St Leonard, Foster Lane, was a Church of England church dedicated to Leonard of Noblac on the west side of Foster Lane in the Aldersgate ward of the City of London.

[3] It was founded in the 13th century by the dean and canons of St. Martin's,[4] to serve the inhabitants of the precinct, who had previously worshipped at the altar of St Leonard in the collegiate church.

[1] The building, which was small, stood in the courtyard of the collegiate church, on the west side of Foster Lane.

[6] the parish instead being united to that of Christ Church, Newgate Street, and the site used as a graveyard.

[1] Some ruins of the church remained, however, until the early 19th century, when they were finally cleared [7] to make way for the new buildings of the General Post Office.