The Bratislava City Museum (Slovak: Múzeum mesta Bratislavy, abbr. MMB) is a museum in Bratislava, Slovakia, established in 1868. Its headquarters are located in the Old Town, near the Main Square at the Old Town Hall. The museum is owned by one of the 11 allowance organizations of the City of Bratislava.

The museum documents the history of Bratislava from the earliest periods until the 20th century. The Bratislava City Museum is the oldest museum in continuous operation in Slovakia, a country first established in 1993.

The Bratislava City Museum manages eight specialized museums with nine permanent displays throughout the city:

Museum of the City History: main museum, which displays archaeological discoveries and findings and documents a history of pharmacy, culture, social life and numismatics
Museum of Arms and City Fortifications in the tower above Michael's Gate
Museum of Clocks, housed at the House of the Good Shepherd
Johann Nepomuk Hummel museum
Arthur Fleischmann museum
Janko Jesenský museum
Devín Castle National Cultural Monument in Devín
Gerulata National Cultural Monument in Rusovce.