Saint-Guilhem-le-Désert Abbey or Gellone Abbey is a Benedictine abbey in Saint-Guilhem-le-Désert, Hérault in France. It was founded in 804 by an Aquitanian aristocrat of the Carolingian era, William of Gellone, known in Occitan as 'Guilhelm'. It was listed as a historic monument by France in 1840 and as part of the Routes of Santiago de Compostela in France World Heritage Site in 1998.