The Windsor Guildhall is the town hall of the town of Windsor, in the English county of Berkshire. It is situated in the High Street, about 100 metres from Castle Hill, which leads to the main public entrance to Windsor Castle. It is a Grade I listed building. The Borough of Windsor possessed a guildhall from early times. A deed of 1369, now in the possession of Eton College, refers to the "gildaule", and a charter of 1439 states that "pleas happening in the said borough...shall be pleaded and holden in the guildhall there, before the mayor and bailiffs for the time being".
Norden's map of 1607 shows a market house in the location of the present guildhall: the main part of it is raised on wooden pillars to allow the space beneath to be used as a covered corn market. There is a myth that the Borough Council required Wren to place additional columns in the centre of the open space, but that, because he regarded them as unnecessary, Wren deliberately left a gap at the top of each column.
In fact, no drawing made before the building of the rear extension in 1829-30 shows any trace of these columns. They were removed from the rear of the building during the construction of the extension and placed inside the open area. They were not quite tall enough to reach the ceiling and careful examination shows that the gaps are filled with tiles smaller than the capitals.