A lawn mower having selectively drivable wheels, includes steerable front wheels, rear wheels, a body frame, an engine supported by the body frame, a mower unit supported by the body frame, a change speed device, a front wheel driving device for transmitting drive from the change speed device to the front wheels, left rear and right rear wheel driving devices, and rear wheel clutches for selectively connecting and disconnecting drive. The rear wheel clutches are operable by an interlocking mechanism to disconnect drive transmission to one of the rear drive wheels moving along an inner track while turning the vehicle body. The interlocking mechanism has a link mechanism operatively connecting a steering mechanism for steering the front wheels to each of the rear wheel clutches.