This thesis presents the development of control structures for gyrostabilizer systems, which are used to dampen unwanted roll motion in sea vessels. Two distinct types of controllers have been studied and compared: (1) the conventional control method, which utilizes the speed and position information of the vessel, and (2) the full feedback controllers, which yield optimal results. A scaled-down gyrostabilizer has been designed for the purpose of testing the designed control studies. The prototype system is designed to model the single degree of freedom roll motion of the ship. The electric motor added to the system enables the modelling and application of the sea state as a disturbance effect. This disturbing effect is attempted to be eliminated by using the gyrostabilizer on the ship model. Prior to the design of the control system, kinematic and dynamic calculations of the system were performed analytically. These analytical solutions were verified by comparing them with the simulation file. In the open forms of analytical solutions, the relationships between the gyroscope and the ship are clearly observed. Since the effect of the nonlinear terms in the analytical solutions was found to be small, the equations were simplified and linear control systems were designed. After mathematical calculations and 3D design, the production of the prototype system was completed. The designed position-velocity (PV-PI) control system and linear quadratic regulator (LQR) based control systems were tested on this prototype system. The results of the tests indicate that, although there is no clear superiority of the two control systems over each other, the fact that the LQR control system has fewer parameters suggests that it can be more easily applied to other ship-gyro combinations.