This paper studies disturbance cancellation control to suppress vortex-induced vibration of a circular cylinder in a cross flow. The cylinder is supported by two pairs of elastic beams and electromagnets are used as control devices. Fluctuating lift force acting on a vortex-induced cylinder is assumed as a disturbance. An observer is constructed to estimate the disturbance. Two different types of disturbance are assumed to describe the fluctuation of vortex shedding. One is a sinusoidal wave and the other is a wake oscillator represented by van der Pol equation. Simulation and experiments are carried out for the examination of the control performance.