Bucur LF is a series of low-floor tram vehicles produced by the URAC section of the STB (formerly RATB) transit company of Bucharest, Romania.

[1] The tram is configured as a three-section 65% low floor vehicle, with two powered and one unpowered bogies.

[2] The vehicle has four double-leaf 1,305 mm (4.281 ft) wide doors, and at the outer ends there are two other single leaf 650 mm (2.13 ft) wide doors.

[3] Initially, the trams were manufactured in the LF-CH version, with direct current motors with chopper, and since 2012 in the LF-CA version, with inverter and alternating current motors.

[4] A five-section vehicle design of 100% low floor and 29 m (95 ft) length was also proposed as Bucur LF2.