The White Tower of Thessaloniki is a monument and museum on the waterfront of the city of Thessaloniki, capital of the region of Macedonia in northern Greece and a symbol of Greek sovereignty over Macedonia.

The present tower replaced an old Byzantine fortification, which was mentioned around the 12th century, and was reconstructed by the Ottomans to fortify the city's harbour. It became a notorious prison and scene of mass executions during the period Greece was under the Ottoman occupation.

It was substantially remodelled and its exterior was whitewashed after Greece gained control of the city in 1912 and has been adopted as the symbol of the city.