The Whalebone Tavern was a public house on Lothbury behind the Royal Exchange in the City of London that was a meeting place for the Leveller movement. The Levellers described themselves as "whaleboneers" in an early printed declaration, and their leader John Lilburne would read various declarations and lead meetings at the tavern.Henry Ireton, Oliver Cromwell's son-in-law, sent spies to the Whalebone to observe the Levellers. It was referred to as one of the Leveller's 'Houses of Parliament'. The Windmill Tavern was similarly associated with the Levellers.