Spasskaya Tower of Kazan Kremlin, Medieval tower at Kremlin, Kazan, Russia.

The Spasskaya Tower is a fortified structure on the southern wall of the Kremlin with four levels, where the lower section features white stone and two upper stories are built from brick in an octagonal shape. It is crowned with a pointed roof and contains a clock mechanism visible from multiple sides.

The white-stone gate tower was built in the 16th century by Pskov architects Ivan Shiryay and Postnik Yakovlev, called Barma, after Ivan IV's 1552 conquest of Kazan. The stone church of the Savior was finished in 1555, and the tower took its name from the icon above its gate. After the 1694 fire it gained two octagonal brick tiers and a brick spire, likely by Moscow masters.

The tower's name comes from the icon of the Saviour Not Made by Hands once placed above its gate; the image was a copy of the banner of Ivan the Terrible, now kept in Moscow's Armoury Chamber. In 1836 Nicholas I made the gate church a military church of the Kazan garrison, and in 1904–1905 a chapel designed by F. Malinovsky was added, consecrated on 21 August 1905. Since 1 September 2023 the tower holds a museum on the fortress fortifications.

The tower sits at the southern entrance to the Kremlin and serves as the main gateway to the entire fortress complex. The best views of the clock and architectural details can be appreciated from outside the compound.

The tower's clock features an unusual design from the 18th century where the clock face rotated around stationary hands instead of hands moving across a fixed dial. This mechanical approach makes it a rare example of alternative timekeeping design.