Bismarck Tower, Observation and television tower in Wetzlar, Germany.

The Bismarck Tower in Wetzlar is an observation and television tower with a stone structure. The building displays architectural features from the late nineteenth century and offers views across the surrounding landscape.

The tower began as the Garbenheimer Warte, a medieval watchtower of Wetzlar's town fortifications. In 1901 it was precisely surveyed and rebuilt as a Bismarck tower to plans by district architect Wilhelm Witte, keeping its defensive watchtower character. Donations covered the roughly 5,500 marks in construction costs, kept low by cheap deliveries from the firms involved. It is one of 146 Bismarck towers still standing in Germany.

The tower is one of 146 surviving Bismarck towers in Germany, built or converted to honour Otto von Bismarck (1815–1898). Below the balcony, an inscription bears a poem by Rektor Luerssen, and a Bismarck coat of arms decorates the exterior. On Bismarck's birthdays, a fire was lit on the tower top.

The tower stands near Wetzlar and is reached on foot; the 18-metre structure is currently closed to the public until further notice, so the climb and the view from the top are not available. The 18-step external stairway and the balcony with the Bismarck coat of arms and the Luerssen poem can still be seen from outside. Check locally before setting out.

The tower's top was built for lighting fires: on Bismarck's birthdays a blazing fire burned on the summit. The 18-metre tower is one of 146 Bismarck towers still standing in Germany, and it is currently closed to the public until further notice.