This article compares the strength, history, and characteristics of public interest groups in the United States and France. French and American public interest groups differ dramatically in their resources, popular support, and in their relations with state agencies. French groups, dependent on a more powerful central state bureaucracy, are often able to achieve their goals by having them adopted by state elites. American organizations, faced with a more diffuse public sector, seek broader access and use a greater diversity of means of influence. They are often less influential, but paradoxically are stronger organizationally because they are forced to be independent from the state. The differing relations with the state explain the different tactics and organizational maintenance strategies pursued by public interest groups in the two countries. Tight links bind the development of a nation's interest‐group system with that of its constitutional structures. An explanation of a national interest‐group system must include consideration of the institutional context within which it opera