The White Tower of Thessaloniki (: Λευκός Πύργος Lefkós Pýrgos) is a monument and museum on the waterfront of the city of , capital of the in northern . The present tower replaced an old , known to have been mentioned around the 12th century, that the reconstructed to fortify the city's fortress some time after Sultan captured Thessaloniki in 1430. During the period of , the tower became a notorious prison and the scene of numerous mass executions, most famously of the Janissaries who revolted during the reign of .
In 1912, as gained control over the city, and the White Tower was substantially remodeled and its exterior was whitewashed. The White Tower has been adopted as the symbol of the city.