The 1965–66 French Rugby Union Championship was contested by 56 teams divided in 7 pools, The four first teams of each pool and the better for classified fifth were qualified for the "last 32".
The Agen won the Championship 1965–66 after beating Dax in the final and hold the title.
Jean-Michel Lucq, Léon Bérho, Christian Lasserre, Marcel Cassiède, Jean-Claude Labadie, Pierre Darbos, Gilles Benali, Claude Contis, Georges Capdepuy, Pierre Albaladejo, Jacques Bénède, Jean-Claude Sanz, Claude Dourthe, Michel Arrieumerlou, Jacques Saubesty