In many applications, the radiation pressure is an undesirable effect, so that the object is to suppress it. This paper is concerned with radiation pressure suppression through active control. The general idea of active control of a structure is to suppress the vibration by applying suitable feedback control forces, which requires sensors capable of measuring the state of the system and actuators capable of applying control forces. A control technique capable of suppressing the far-field radiation pressure is developed. Copyright 1990 Acoustical Society of America