Classical feedback control for floating offshore wind turbines has limited capabilities to reduce wave disturbances. Feedforward control uses disturbance measurement, to construct an additional control law such that the disturbance is attenuated. The main objective of this work is to prove the concept of wave-FF control to attenuate wave disturbances. High-fidelity simulations demonstrate that FF control, based on wave measurements, is able to reject wave disturbances on the rotor speed effectively.