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The Thermes de Cluny are the ruins of Gallo-Roman thermal baths lying in the heart of Paris' 5th arrondissement, and which are partly subsumed into the Musée national du Moyen Âge - Thermes et hôtel de Cluny.
It is believed that the bath complex was built by the influential guild of boatmen of 3rd-century Roman Paris or Lutetia, as the consoles on which the barrel ribs rest are carved in the shape of ships' prows. Like all Roman Baths, these baths were freely open to the public, and were meant to be, at least partially, a means of romanizing the ancient Gauls.