In order to mitigate vibrations in structures subjected to dynamic loads, some control devices have been studied to reduce the forces and deformations caused by these loads.One of these control devices is the magnetorheological (MR) damper, a semi-active control device that consists of a controllable fluid, called magnetorheological fluid, that can change its rheological properties quickly in the presence of a magnetic field.This damper gives the structure robustness, reliability, and high stability.MR dampers have a strong nonlinear behavior, so it is necessary to work on non-linear control algorithms, which are methods derived from mathematical formulations or intelligent methods, to achieve optimal control forces to reduce the response of the controlled structures.This paper figures out how to reduce the response of a building equipped with MR dampers subjected to different seismic loads using a classic fuzzy logic controller.The proposed controller aims to find the adequate voltage that must be applied to the damper to generate damping forces that reduce the lateral displacements and velocities generated after the dynamic load has been applied.The results show that the use of an MR damper with the fuzzy logic controller decreases the response of the structure, demonstrating that the implementation of these devices is appropriate to control structures subjected to earthquake loads.