A case of mesenchymal hamartoma of the liver in a Korean infant,12 month old, is reported and relevant literature are briefly reviewed. Abdominal distention and palpable abdominal mass became manifest about 1 month before admission. The tumor was found attached by a pedicle to the inferior margin of the right lobe of the liver, measured 13×12×8cm and weighed 800gm. Successful surgical resection was made. Pathological findings were typical of mesenchymal hamartoma.