Abnormal liver chemistries, unexplained fevers, or hepatomegaly prompted 36 liver biopsies on 34 patients with the acquired immunodeficiency syn-drome. The most common finding was the presence of hepatic granulomas, seen in 13 of the biopsy specimens. Eight of these granulomas were illdefined, and 5 were more clearly associated with mycobacterial disesse. Portal fibrosis and fatty infiltration were comon, but a paucity of significant inflammatory activity was seen despite elevated aspartate aminotransferase levels, perhaps related to the underlying imunoincompetent status. Other noteworthy histopathologic findings included 1 patient each with peliosis hepatitis and cryptococcal hepatitis. Electron-microscopic evidence of cytoplasmic tubular structures or viral particles were seen within the hepatocytes of 2 patients. It is concluded that a broad spectrum of hepatic histopathology may be seen in the acquired immunodeficiency syndrome, and that liver biopsy may be diagnostically valuable in the clincial investigation of such patients.