The MV Agusta 350B (Bicilindrica) was a series of motorcycles produced by the Italian manufacturer MV Agusta from 1970 to 1974. The motorcycle was first introduced at the Milan motorcycle show in 1969. The introduction of the "350" model was intended to bridge the production gap of MV Agusta in the medium-displacement sector and to take advantage of the prestige gained by the dominant GP racers. It was produced in "Sport", "Gran Turismo" and "Scrambler" versions. The series was replaced by the MV Agusta 350 Ipotesi in 1975.