St Mary Mounthaw or Mounthaut[1] was a parish church in Old Fish Street Hill in the City of London.

The church stood on the west side of Old Fish Street Hill in Queenhithe Ward.

[2] One of them, John Skypp, personal chaplain to (and champion of) Anne Boleyn,[3] was buried in the church.

[1] Along with the majority of the 97 parish churches in the City of London, St Mary Mounthaw was destroyed by the Great Fire in September 1666.

[4] In 1670 a Rebuilding Act was passed and a committee set up under Sir Christopher Wren to decide which would be rebuilt.