Mark Masons' Hall in London is the headquarters of The Grand Lodge of Mark Master Masons of England and Wales, which is also responsible for the Royal Ark Mariner degree. It is located in 86 St James's Street in the central London district of St James's, opposite St James's Palace. While Freemasons' Hall is the headquarters of the United Grand Lodge of England and the Supreme Grand Chapter of Royal Arch Masons of England, Mark Masons' Hall is the home of several other important appendant orders of Freemasonry in England and Wales.
