Abstract: The self-leveling, gravity-stabilized, sliding and tilting support for a chair is a gravity-powered human stabilization device for use on moving craft such as boats, ships, cars, trucks and aircraft. This device belongs to a family of human stabilization devices often referred to in the past as “gimbaled chairs.” Similarly purposed devices often known as “rolling chairs” also have been invented. The present invention performs the same function as gimbaled chairs and rolling chairs but is much smaller, lighter, simpler, cheaper to make; lacks spindles or gantries, axles, wheels, bearings or metallic tracks; needs no maintenance or lubrication; and has just one moving part. The basic device is constructed of just nine parts. These components are very simple; all can be readily, inexpensively fabricated using common composite construction techniques. At the heart of the device is a rotationally sliding payload platform. The platform is secured atop a semi-circular, upwardly curved dish.