Abstract: Embodiments of the present invention relate to a variable width watercraft hull that includes a hull body, a first side panel movably mated to the hull body and a second side panel movably mated to the hull body in which the first side panel and the second side panel are able to change position in relation to the hull body between an extended position and a retracted position and in which changing position of the first side panel and the second side panel results in a change in the width of the watercraft hull. The hull side panels change position by rotating about a longitudinal axis. The hull can be implemented as a displacement type, a planning type, or a hybrid of the two.