Although the gastrointestinal tract is one of the major sites of primary extranodal malignant lymphoma, the colon and small bowel are less frequently involved than the stomach. Mantle cell lymphoma comprising only 6% of the malignant non-Hodgkin lymphomas. Mantle cell lymphoma usually distributes from the esophagus to rectum, with advanced stages of peripheral lymphadenopathy, splenomegaly, and bone marrow infiltration. We report a case of ileocolic intussusception due to ileal mantle cell lymphoma. (Intestinal Research 2006;4:61-63)