Primary gastric lymphomas can be defined as lymphomas which are confined to the stomach without systemic metastasis. Primary gastric Burkitt's lymphoma is a rare disease that belongs to the aggressive non-Hodgkin's lymphomas. Chemotherapy is the mainstay of treatment, even in the localized disease. We report a case of primary gastric Burkitt's lymphoma in a 24-year-old female presenting with an intermittent epigastric pain for 3 months. Upper gastroduodenal endoscopy detected an ulcer with thickened folds on the greater curvature side of the lower body, and histologic examination of the biopsy specimens revealed infiltration of medium-sized lymphoblasts with characteristic "starry sky" macrophages. Abdominal CT scan demonstrated marked gastric wall thickening and regional lymph node enlargement.