Primary splenic lymphoma is a relatively rare cause of splenomegaly; its reported incidence being less than 1% of non-Hodgkin lymphoma in most reported series. We report a 10 year-old boy presenting with a huge splenic mass which was found incidentally after an abdominal contusion. Diffuse large cell lymphoma of the spleen with no evidence of disease dissemination was proven after tumor resection. After surgery and adjuvant chemotherapy, he has remained disease free 3 years since the diagnosis. The purpose of this paper is to report a rare occurrence of primary splenic lymphoma in a child.