Abstract: The present study was to investigate the anti-ulcer activity of methanolic extract of Cucumis melo (MECM) seeds. The seeds were extracted with methanol and the extract was evaluated for its free radical scavenging activity by DPPH. It shows maximum antioxidant activity. Thus extract was further evaluated against gastric ulcerations by Pyloric Ligation (PL), Water Immersion Stress (WIS) and NSAID (indomethacin) induced ulcer (NIU) models. In case of PL method, the extract inhibited gastric ulcerations in a dose-related manner (150 and 300 mg kg^-1). Then it was evaluated for gastric volume, free acidity, total acidity, ulcerative index. The ulcerative index was also measured in WIS model and NIU with same doses. The MECM caused 57.6, 67.6 and 61.9% inhibition of ulcers in pyloric ligation, water immersion stress, NSAID induced ulcer models respectively at 300 mg kg^-1. The results concluded that MECM possess high antiulcer potential which is due to its higher antioxidant activity.