Abstract: A readily mountable and removable portable boat dolly for mounting to a boat to aid in transporting the boat over land is shown, including a pair of wheel support units, each having a mounting surface for frictionally engaging the bottom of the boat. A pair of wheels are rotatably mounted to each of the wheel support units. A mounting strap engages the wheel support units below the mounting surfaces thereof, with the strap having hooks at both ends configured for hooking over the gunwales of the boat. Levers are provided for applying and maintaining tension in the mounting strap, whereby the mounting surfaces of the wheel support units are held in frictional engagement with the bottom of the boat.