Guillem de Cabestany (Catalan pronunciation: [giˈʎɛm də kəβəsˈtaɲ]) (1162–1212) was a Catalan troubadour from Cabestany in the County of Roussillon. His name in Occitan is Guilhem de Cabestaing, Cabestang, Cabestan, or Cabestanh; in modern Occitan it is spelled Guilhèm.
According to his legendary vida, he was the lover of Seremonda (or Soremonda), wife of Raimon of Castel Rossillon. On discovering this, Raimon fed Cabestanh's heart to Seremonda. When he told her what she had eaten, she threw herself from the window to her death. This legend appears later in Giovanni Boccaccio's Decameron and in the Cantos of Ezra Pound. With reference to regional historian Jules Canonge, Cabestany is presented as the archetypal troubador in Ford Madox Ford's book Provence.