Jacques Eléonor Rouxel de Grancey, Comte de Médavy (31 May 1655 – 6 November 1725) was a French military officer and Marshal of France who fought in the Nine Years' War and the War of the Spanish Succession.

He also had an illegitimate son Claude Rouxel de Blanchelande, who served in the French military.

[2] Between 1705 and 1725, he built the Château de Grancey-le-Château-Neuvelle on the site of an existing medieval fortress, which is still used.

During the War of the Spanish Succession, he served mainly in Italy under the duc de Vendôme, taking part in most of the battles in that theatre.

When Vendôme returned to France in July 1706, Médavy was left in command of Lombardy and defeated a Hessian corps at Castiglione in September.