Background: Peptic ulcer disease is a result of an imbalance between aggressive and defensive factors. Morin, a bioflavonoid exhibits many biological activities such as antioxidant and anti-inflammatory properties. Objective: The present study was conducted to unravel the therapeutic potential of morin in acetic acid-induced gastric ulcer. Materials and Methods: Gastric ulcer was induced in male Wistar rats (180-220 g) by applying glacial acetic acid (10 M, 100 μL) to serosa of the stomach. Morin (10, 30 and 100 mg kgG 1 , p.o.) was administered for 15 days after the induction of ulcer. After end of treatment gastric specimens were collected for biochemical and histological evaluation. Results: There was a significant (p<0.01 and p<0.05) reduction in the ulcer area and ulcer index by morin (30 and 100 mg kgG 1 ) treatment. It also significantly (p<0.01 and p<0.05) decreased the level of malondialdehyde (MDA) and increased levels of superoxide dismutase (SOD) as well as reduced glutathione (GSH). Histological aberration induced by acetic acid also reduced by morin administration. Conclusion: The present findings elucidate the antiulcer potential of morin in the acetic acid induced gastric ulcer by virtue of its antioxidant property.