Gastric volvulus with diaphragmatic hernia is a rare presentation in adults. A 30–year–old female patient presented with history of pain abdomen for 3 days and vomiting for 2 days. Clinical examination showed supraumbilical distention with pain above the umbilicus. CT abdomen and pelvis showed gastric volvulus with pneumoportalis. On laparotomy she was found to have gastric volvulus with gangrene of fundus with diaphragmatic hernia. Resection of the gangrenous segment of fundus and greater curvature with primary closure of the diaphragmatic defect was done. Thus, high degree of suspicion in diagnosis and early intervention is necessary to decrease the high morbidity and mortality associated with acute gastric volvulus.