Clamecy is a commune in the Nièvre department in central France.

Clamecy is the capital of an arrondissement in the department of Nièvre, at the confluence of the Yonne and Beuvron and on the Canal du Nivernais, 46 m. N.N.E. of Nevers on the Paris-Lyon railway.

Clamecy is locally described as the Capital of the valleys of the Yonne and classified under the French tourist criteria "Station Verte de Vacances" (centre for outdoor activity–based vacations) and among the "Plus Beau Détour de France" (most beautiful routes in France).