The article is devoted to genesis, doctrinal interpretation and practical application of the concept of the public interest in French law. The modern interpretation of the public interest goes back to the concept of the common will J.-J. Rousseau. French doctrine does not consider the public interest as a set of private interests, but on the contrary, opposes it to them. The public interest is understood as the common will of the nation and has priority over the interests of individuals. Public interest is both a base, and a restriction of the activities of public authorities, which should ensure its implementation, but can not act beyond necessity for that. The French Conseil d'État and administrative courts used the concept of public inte...