Claude Favre de Vaugelas (January 6, 1595 - February 1650) was a French grammarian and man of letters.

Born at Meximieux , in the Ain départment of France of Ain. He became gentleman-in-waiting to Gaston, Duke of Orleans, and continued faithful to this prince in his disgrace, although his fidelity cost him a pension from the crown on which he was largely dependent.

His thorough knowledge of the French language and the correctness of his speech won for him a place among the original members of the Académie française in 1634. On the representation of his colleagues his pension was restored so that he might have leisure to pursue his Remarques sur la langue française (1647). In this work he maintained that words and expressions were to be judged by the current usage of the best society, of which, as an habituel of the Hotel de Rambouillet, Vaugelas was a competent judge. He shares with Malherbe the credit of having purified French diction. His book fixed the current usage, and the classical writers of the 17th century regulated their practice by it.

Protests against the academical doctrine were not lacking. Scipion Dupleix in his Liberté de la langue française dans sa pureté (1651) pleaded for the richer and freer language of the 16th century, and François de La Mothe-Le-Vayer took a similar standpoint in his Lettres a Gabriel Naudi tombant les Remarques sur la langue française.

Towards the end of his life Vaugelas became tutor to the sons of Thomas Francis of Savoy, Prince of Carignano. He died in Paris in February 1650.

His translation from Quintus Curtius, La Vie d'Alexandre (posthumously published in 1653) deserves notice as an application of the author's own rules.