Gronau () is a river of Hesse, Germany and a right tributary of the Sinn. Including its left source river Westernbach, it has a total length of .

Course The Gronau rises in the unincorporated area Gutsbezirk Spessart in the Hessian part of the Mittelgebirge Spessart. It flows into the Sinn at Altengronau.

See also List of rivers of Hesse

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