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.

It is a right tributary of the Saône into which it flows in Marnay.

Its largest tributaries are the Guye and the Grison.

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