William of Baskerville (Italian: Guglielmo da Baskerville) is a fictional Franciscan friar from the 1980 historical mystery novel Il nome della rosa (The Name of the Rose) by Umberto Eco, which is itself a recounting of events as experienced by the Adso of Melk, a Benedictine novice with whom William travels. Years earlier, as an inquisitor, Brother William presided at some trials in England and Italy, where he distinguished himself by his perspicacity along with great humility.