Pietro Trifone (Rome, 27 April 1951), is an Italian linguist.
Trifone lectures Italian history at the department of philology, linguistics and literature of the University of Rome Tor Vergata. He has also led research work at the universities of Rome, Chieti, Pescara, and Siena.
With Maurizio Dardano he has written a reference grammar of the Italian language. With Luca Serianni he has edited the Storia della lingua italiana in three volumes.
He has been rector of the Foreigners University of Siena (1996–2004).
He is co-director of the magazines La lingua italiana and Carte di viaggio.