Beliefs and attitudes underlying wilderness visitors’ support for use restrictions were studied. Some evidence shows that in overused places visitors cite both protection of the resource and the wilderness experience as reasons for supporting restrictions. The research reported here provides the opportunity to assess the relative contribution of each of these reasons, and others, to visitor support for use restrictions at three wildernesses in Oregon. Support for reducing the total amount of use was best predicted by crowding measures for day visitors and by a combination of crowding and physical environment impact (dominated by physical impacts) for overnight users. This knowledge has implications for other situations involving conflicting demands on natural resources.