Louis Barbier (1593 - 1670) was a French bishop.

Born of humble parents in Vaudelain court, near Compiègne, France. He entered the church and made his way by his wit and cleverness, until he was appointed tutor and then became the friend and adviser, of Gaston d'Orléans, brother of Louis XIII. He thus gained an entrance to the court, became grand almoner of the queen, and received the revenue of rich abbeys.

In March 1655 he was named bishop of Langres, but he spent his time at court, where his wit was always in demand, and where he gained great sums by gambling. He died very rich.