Jean-Baptiste DuBarry, Comte du Barry-Cérès, vidame de Châlons en Champagne (1723 - 17 January 1794) was a French nobleman. He is most notable as the lover and pimp of Jeanne Bécu (later better known as Madame du Barry, Louis XV's last official mistress), later becoming her brother-in-law by arranging a marriage-of-convenience between her and his younger brother Guillaume Dubarry at the église Saint-Laurent de Paris on 1 September 1768. Through that union the two brothers benefitted.