The Grosne (French: la Grosne, French pronunciation: [ɡʁon]) is a 96.7-kilometre (60.1 mi) long river in the Rhône and Saône-et-Loire departments in central eastern France. Its source is near Saint-Bonnet-des-Bruyères. It flows generally north. It is a right tributary of the Saône into which it flows in Marnay. Its largest tributaries are the Guye and the Grison.

Departments and communes along its course

This list is ordered from source to mouth:

• Rhône: Saint-Bonnet-des-Bruyères
• Saône-et-Loire: Saint-Pierre-le-Vieux, Saint-Léger-sous-la-Bussière, Trambly, Montagny-sur-Grosne, Brandon, Clermain, Mazille, Sainte-Cécile, Jalogny, Cluny, Cortambert, Lournand, Massilly, Bray, Taizé, Ameugny, Cormatin, Malay, Savigny-sur-Grosne, Saint-Gengoux-le-National, Sercy, Bresse-sur-Grosne, Santilly, La Chapelle-de-Bragny, Messey-sur-Grosne, Lalheue, Laives, Saint-Ambreuil, Beaumont-sur-Grosne, Saint-Cyr, Varennes-le-Grand, Marnay