Elevated transaminases occur in up to 17% in patients with inflammatory bowel disease. Primary sclerosing cholangitis (PSC) is an important cause for elevated liver enzymes in these patients whereas autoimmune hepatitis is rare. Both diseases can overlap. We report two patients with an autoimmune hepatitis. One patient had Crohn's disease and arthritis with morphological liver changes typical for autoimmune hepatitis but without the characteristic autoantibody pattern. The other patient suffered from ulcerative colitis. He had antinuclear and antiactin antibodies as in autoimmune hepatitis type I. however, histological examination of the liver showed bile duct changes. Transaminases declined significantly in both patients after onset of steroid treatment. Therefore, the diagnosis of autoimmune hepatitis in patients with inflammatory bowel disease must not be missed, as immunosuppressive therapy improves the prognosis of the illness.