We report a case of a lymphangioma of the jejunum which was surgically resected. The case involved a 16-year-old male who had realized a sense of abdominal distension for the past 5 years. He visited a hospital because of a 2-week history of abdominal pain and ultrasound examination revealed an abdominal tumor. He was referred to our hospital. Abdominal CT scan and MRI showed a multilocular cystic mass, about 13cm in longer diameter, without enhancement effect at the midline of the abdominal cavity and the mass had fluid-fluid level formed by high and low density components. We diagnosed the mass as mesenteric lymphangioma with repeated bleeding and performed operation. On laparotomy, the 10-cm diameter mass was found in the mesentery of the jejunum near the ligament of Treitz and was resected with a part of the jejunum close to the mass. The histopathological diagnosis was lymphangioma of the jejunal mesentery. Lymphangioma of the jejunal mesentery is relatively rare. We review 30 cases reported in Japan, including this case.