Sterntor, Medieval city gate in Bonn, Germany.

The Sterntor is a medieval city gate in Bonn with a stone archway and corner towers topped with crenellations. The structure preserves fragments of the original city wall and a semi-circular defense tower that once protected the medieval city.

The original Sterntor was built around 1244 at the end of Sternstraße as part of Bonn's medieval fortifications. In 1898 the last surviving gate tower was demolished to improve traffic flow, despite intervention by Kaiser Wilhelm II. In 1900 a replacement was erected a few metres away on the north side of Bottlerplatz at Vivatsgasse, using remnants of the old gate, a piece of the city wall and its only surviving semicircular tower.

The two reliefs in the outer arch are the Crucified with Mary and John, and a "Mother of God with Seven Sorrows" dated 1650. The gate also carries a corner turret and a crenellated parapet, details of the Historicism style of the 1900 rebuild.

The gate stands on the north side of Bottlerplatz at Vivatsgasse, a few metres from the site of the original gate at the end of Sternstraße. It is a free-standing monument in the pedestrian zone, so it can be viewed at any time from the surrounding square.

The gate is a 1900 Historicist replacement, not the medieval original: it combines surviving pieces of the old Sterntor with a remnant of the city wall and its only preserved semicircular tower. Its corner turret and crenellated parapet date from that reconstruction.