Regime theory, when applied to interest groups at the local level, predicts institutional groups to have consistent influence over policy decisions, whereas the influence of episodic groups is anticipated to be relatively random. The following paper tests this theory within the domain of land use policy using data collected from a national survey of American Planning Association (APA) members. A series of empirical models are estimated to assess local government plannersí perceptions of aggregate interest group influence over land use policy decisions, as well as the relative influence of specific interest groups, while controlling for the mitigating effects of government structure and municipal characteristics. The results link regime theory to the existing land use policy literature and offer new insight into the politics of planning.