New White Tower, Prison tower in Prague Castle, Czech Republic

The White Tower is a late-Gothic tower in Golden Lane, between the Daliborka and Mihulka towers in the northern fortification of Prague Castle. It has a horseshoe-shaped plan, five storeys and a height of 27.5 m; the top floor, added in 1522, has much thinner walls.

Built after 1486 during the fortification of Prague Castle's north side, probably by Benedikt Rejt, the tower gained a thinner-walled top floor in 1522. In 1586–1587 it was converted into a prison, taking over the name of the older Romanesque White Tower. It held leaders of the 1618 Bohemian revolt, executed in 1621, and was used as a prison until the 18th century, then as a store.

The tower's name comes from the older Romanesque White Tower that guarded the castle's western entrance; the prison and its name were transferred here in 1586–1587. In the upper floors, visitors can still see original fittings such as a stove, fireplace and privy, along with drawings and inscriptions left by 16th- and 17th-century prisoners.

Visiting the tower requires a Prague Castle ticket, with trams 22 and 23 stopping at Prazsky hrad station nearby. The narrow staircases inside demand good mobility and sturdy footwear.

The tower's name comes from an older Romanesque White Tower that once guarded the castle's western entrance; the present tower took over the name along with the prison role in 1586–1587. Its top floor held the cell of Martin Fruwein z Podolí, who in June 1621 squeezed through a dormer onto the roof and jumped into the Stag Moat.