Tournon-sur-Rhône (French: [tuʁnɔ̃ syʁ ʁon]; Occitan: Tornon, before 1988: Tournon)[3] is a commune in the Ardèche department of southern France.

It is one of the most populous communes in the Ardèche department, after Annonay, Aubenas, and Guilherand-Granges.

It is located on the right bank of the river Rhône, in the Ardèche departement,[4] opposite Tain-l'Hermitage, (which is located in the Drôme département).

Tournon had its own counts as early as the 9th century reign of Louis I.

In the middle of the 17th century the title passed from them to the dukes of Ventadour.