Brugg Black Tower, Medieval fortified tower in Brugg, Switzerland.

The Black Tower in Brugg is a medieval fortified structure rising about 26 meters high at Rathausplatz in the old town. Its thick stone walls still display late-Gothic features and form the base of a distinctive building that has stood for centuries.

The tower was built in the last quarter of the 12th century, probably on the orders of Count Albrecht III of Habsburg, and was first documented in 1238. In 1535 the upper walls and roof were demolished and new storeys added, raising it by about five metres; an oriel followed in 1536. From 1846 it served as the district prison, and the cells were closed in November 2006.

The tower's name predates its later blackened appearance; it was long called "Römerturm" because of reused Roman stone. Since 1579 it has been physically joined to the late-Gothic town hall, and the two are perceived as one complex. The tower also served as the district prison from 1846 until the cells were closed in November 2006.

The tower sits centrally at Rathausplatz and is easy to reach on foot when walking through the old town. The area is flat and easy to navigate, so visitors of all abilities can explore the exterior and surroundings without difficulty.

The tower's lower 13.5 metres are built of reused Muschelkalk masonry from the Roman legionary camp of Vindonissa, not from its foundations. A round arch on the north wall, carved in Romanesque style, probably came from an 11th-century church demolished before the tower was built.