A bicycle drive unit includes a housing, a motor, a crank axle, and at least one fin member. The motor is disposed within the housing. The crank axle is rotatably supported relative to the housing about a first rotational axis. The fin member is rotatably arranged relative to the housing. The fin member is operatively coupled to the crank axle to rotate and to generate an air flow within the housing in response to rotation of the crank axle.