Trévoux (French pronunciation: [tʁevu]; Arpitan: Trevôrs) is a commune in the Ain department in eastern France.

It is a popular destination outside of Lyon, built on the steeply sloping left bank of the river Saône and is known for its fort.

[3] From that time, the Trévoux river toll became important, and the town built a castle and walls.

On the 30th of June 1417, the local baron issued a decree allowing the local Jewish population to continue to study the Talmud, contrary to the decision taken in Chambéry in January 1417 as a result of which Jewish books had been seized and burned.

[3] At the end of the 17th century, two important sovereign princes, Anne-Marie Louise of Orléans, Duchess of Montpensier known as "la Grande Mademoiselle", and her successor Louis-Auguste of Bourbon, duke of Maine, raised two monuments which are still notable in the landscape: the Montpensier hospital and the Palace of the Dombes Parliament.