Joseph Vendryes or Vendryès (French: [vɑ̃dʁiɛs]; 13 January 1875 – 30 January 1960) was a French Celticist.
After studying with Antoine Meillet, he was chairman of Celtic languages and literature at the École Pratique des Hautes Études. He founded the journal Études Celtiques. He was a member of the Académie des Inscriptions et Belles-Lettres and a consultant with the International Auxiliary Language Association, which standardized and presented Interlingua.