Bertrand de Bar-sur-Aube (i.e. Bertrand from Bar-sur-Aube) (end of the 12th century – early 13th century^[1]) was an Old French poet from the Champagne region^[1] of France who wrote a number of chansons de geste. He is the author of Girard de Vienne, and it is likely that he also wrote Aymeri de Narbonne.^[1] The chansons de geste Narbonnais and Beuve de Hantone have also been attributed to him, but these attributions are contested.^[1] At the beginning of Girart de Vienne, the author describes himself as a "clerc" or cleric.^[1] No other biographical information is known about him.^[1]