Abstract: A Gravity-Buoyancy Object Turbine (GBOT) is provided to generate kinetic energy using gravitational force and buoyancy force exist in the nature. The turbine of the invention has a gravity (air) chamber and a buoyancy (liquid) chamber, arranged side-by-side in such a way that both gravity and buoyancy exerts force directly and continuously on the shaft/drum/belt to cause the rotation of the turbine. The turbine blades (objects) forms the shape of a wheel, which enables leak-proof and resistance-free transfer between air and liquid chambers. The objects could be cylindrical and rotating by its own. The material, size and shape of key components and related control mechanisms of GBOT are optimized to deliver maximum performance.