Morgagni hernia is an uncommon presentation representing about 3% in incidene and usually located in the right-sided anterior diaphragm. We experienced a case of Morgagni hernia in a seventy four-year-old male who was admitted complaining of intermittent abdominal pain. The diagnosis was made initially by chest and abdominal radiography, and an incarcerated Morgagni hernia was finally diagnosed with abdominal CT scans. Emergent laparotomy was performed. Morgagni foramen was located on the left-sided anterior diaphragm and Morgagni hernia which contained greater omentum and strangulated small intestine was gently reducted. Morgagni foramen measuring 4x5 cm was repaired with a Gortex mesh. We reported the experience of left-sided Morgagni hernia complicating incarcerated small bowel hernia in an old male patient.