The Flxible Co. was an American manufacturer of motorcycle sidecars, funeral cars, ambulances, intercity coaches and transit buses, based in the U.S. state of Ohio. It was founded in 1913 and closed in 1996. The company's production transitioned from highway coaches and other products to transit buses over the period 1953–1970, and during the years that followed, Flxible was one of the largest transit-bus manufacturers in North America.

A sidecar is a one-wheeled device attached to the side of a motorcycle, scooter, or bicycle, making the whole a three-wheeled vehicle. A motorcycle with a sidecar is sometimes called a combination, an outfit, a rig or a hack.