Alain Lipietz (born September 19, 1947, Charenton-le-Pont as Alain Guy Lipiec) is a French engineer, economist and politician, a Member of the European Parliament, and a member of the French Green Party.

Alain Lipietz studied at the École polytechnique (entered in 1966) and the École Nationale des Ponts et Chaussées (diploma in 1971). He then obtained a master's degree in economy (1972).

He became a researcher at the Institut de recherche des transports (transportation research institute, 1971–1973) and at the Centre d'études prospectives d'économie - Mathématiques appliquées à la planification (Center for prospective studies of economics - applied mathematics for planification, 1973–1999). He became a research director at CNRS in 1988. Since 1990, he is chief engineer at the Corps of Bridges and Roads (France).

Since the beginning of his career, he has devoted himself to the analysis of social-economic relationships within human communities. He is thought of as having contributed to the Regulation school of economic thought.