St Andrew Undershaft is a Church of England church in the City of London, the historic nucleus and modern financial centre of London. It is located on St Mary Axe, within the Aldgate ward, and is a rare example of a City church that survived both the Great Fire of London and the Blitz.
The present building was constructed in 1532 but a church has existed on the site since the 12th century. Today, St Andrew Undershaft is administered from the nearby St Helen's Bishopsgate church.