This paper analyses the main antitrust decisions in the agribusiness sector in Europe. First, legislation and economic principles are recalled. Then for input suppliers, farmers, manufacturers, and retailers, we give a brief presentation of the market structure and discuss the main competition concerns according to the most recent antitrust decisions. Farmers are the weakest link of the entire chain, given the degree of concentration in the upstream and downstream industries in Europe. The use of the concept of buying power could be developed by competition authorities to balance power along the agro-food chain. Copyright 2002, Oxford University Press.