Zytturm, Clock tower in central Zug, Switzerland.

The Zytturm is a 41.5-metre stone tower on Kolinplatz in Zug's old town, built in the 13th century and given its present form in 1557 with a watch room, oriel windows and a steep hipped roof. Its eastern face carries a large clock installed in 1574, with an astronomical dial below the clockface and the shields of the Eight Old Cantons painted beneath it. A pointed archway opens through the base.

The Zytturm was built in the 13th century and heightened between 1478 and 1480. It received its present form with the guard room, oriel windows and steep hipped roof in 1557, and the large clock was installed in 1574. The last major restoration took place in 1952.

The name derives from Zug's Alemannic German word for time, Zyt, and the tower served for centuries as the city's fire watchtower, from which guards scanned the rooftops. On the eastern face, below the astronomical clock, the painted shields of the Eight Old Cantons recall the confederacy of 1353 to 1481. The tower remains the emblem on Zug's civic identity.

The tower stands at Kolinplatz in Zug's old town, beside the city walls and other towers listed with it as being of National and Regional Significance. The astronomical clock and the painted coats of arms are on the eastern side, facing the square, so they can be examined from street level without entering. The tower was last extensively restored in 1952.

The eastern wall displays the coats of arms of the Old Eight Cantons, recording the members of the Swiss Confederacy from 1353 to 1481. These heraldic symbols tell the story of early Swiss unity in a visual way that few visitors initially notice.