We report a case of granulomatous hepatitis in a patient with hyperthyroidism resulting from Graves' disease. A 30-year-old man presented with massive weight loss, jaundice, tachyarrhythmia and goitre. Liver function tests showed mild cytolysis and cholestasis and massive hyperbilirubinaemia. The echogram of liver and bile ducts was normal and no infection was found. A liver biopsy revealed a mixed cytolytic and cholestatic hepatitis with intralobular epithelioid granulomas. No specific cause was identified, and sarcoidosis and primary biliary cirrhosis were ruled out. The outcome was favourable with antithyroid therapy and short-term glucocorticoid therapy, and the patient was totally free of symptoms after 2 years. To our knowledge, this is the first case of granulomatous hepatitis to be reported in association with Graves' disease. The clinical evolution of the liver disease paralleled the evolution of hyperthyroidism.