The MV Agusta 125 Bialbero was a 125 cc factory racer from the Italian brand MV Agusta, which was used between 1950 and 1960. The machine won 34 GPs, 6 rider's championships and one manufacturer's championship. The machine also won 4 Italian Championships and 10 National Championships in other countries.

MV Agusta is a high end motorcycle manufacturer founded by Count Domenico Agusta on 19 January 1945 as one of the branches of the Agusta aircraft company near Milan in Cascina Costa, Italy. The abbreviation MV stands for Meccanica (mechanics) Verghera, the hamlet where the first MVs were made. The modern headquarters and main production facilities are located in Varese, Italy on the shore of Lake Varese.