Černá věž, Renaissance tower in Klatovy, Czech Republic.

Černá věž is a late Gothic stone clock tower, bell tower and lookout on the southwest corner of náměstí Míru in Klatovy, next to the Renaissance town hall. It rises 81.6 m in nine tower storeys, topped by a pyramidal roof with four small corner turrets, and its gallery at about 50 m is reached by 226 steps.

The prosperous royal town commissioned the Italian builder Antonio de Sala to construct the tower in 1547, both for defence and as a display of the town's wealth. The stone tower was completed in 1557 after ten years of work, and in 1583 a bell cast by Martin Jindra, later named Bartoloměj, was hung in it. A fire in 1758 melted the original bell and scorched the tower, which gave it the nickname Black Tower.

The name Černá věž, Black Tower, dates from the fire of 1758, which scorched the tower and left it with a darker shade. The bell Bartoloměj, recast in 1760 by P. A. Jacomini and known as Vondra, is still rung by a team of about ten bell-ringers, always swung by two men, at least eight times a year.

The viewing gallery sits about 50 metres up and is reached by 226 steps. The tower stands at 412 metres above sea level on the south-west corner of Náměstí Míru, next to the Renaissance town hall. The clock faces measure 4.26 by 4.26 metres, and the hour hand alone is two metres long.

The tower's lower section holds a 24-hour astronomical clock designed by professor Ferdinand Vaněk (1849–1939); it stood out of order for years and was repaired only in 2000. The clock faces on all four sides were fitted in 1855 by mechanic Jan Bošek, and their Roman numerals were replaced with Arabic ones in 1904.