Saint Ceratus of Grenoble (; also Ceras or Gerase) was a 5th-century bishop of Gratianopolis, now Grenoble.Bernard Bligny (dir.), Le diocèse de Grenoble, Beauchesne, Paris, 1979Jean-Joseph-Antoine Pilot Thorey, History of Grenoble and surrounding area from its foundation as the Cularo until today (Baratier brothers, 1829) page 304 He is venerated as a saint by the Roman Catholic Church; his feast day is celebrated on 6 June.
He is commemorated in the placename Rue Saint-Cérat in Éauze.
Life Ceratus was bishop of Gratianopolis in Dauphiné, France, between about 441 and 450.Albert Du Boys, Vie de Saint Hughes (notice chronologique sur les évêques de Grenoble (1837), p 333 During his episcopate he opposed the Arianism of the Burgundian invaders, by whom he was eventually driven into exile.
His relics were preserved in in the Archdiocese of Auch.
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