Primary gastric malignant lymphoma is a rare tumor. The complications associated with lymphoma are perforation, bleeding, or upper gastrointestinal stricture. While it is well known that perforations in gastric lymphoma often occurs during chemotherapy, spontaneous perforation is extremely rare in patients who did not receive chemotherapy. This complication requires a surgical treatment. Primary gastric malignant lymphoma is a rare tumor. The complications associated with this lymphoma are perforation, bleeding, or upper gastrointestinal stricture. While the perforation in gastric lymphoma during chemotherapy is well known, spontaneous perforation is extremely rare in chemotherapy‐naive patients.