Abstract: A height adjustable toilet bowl is provided including a water actuated cylinder (10) for moving it between a low position and a high position, a cleaning water circuit (1) adapted to be connected to a water supply pipe (2), a hose (11) interposed between the cleaning water circuit (1) and the water supply pipe (2) and an outlet pipe (3) connected to a discharge duct (4) through an extensible pipe (12), wherein the water actuated cylinder (10) is a flexible cylinder connectable selectively to the water supply pipe (2) and to the cleaning water circuit (1) through a three position valve (13), a pipe (16) being interposed between the flexible cylinder and the three position valve.