Endometriosis is described as the presence of functioning endometrial tissue outside the uterine cavity. Scar endometriosis is a rare disease, and is difficult to diagnose. The symptoms arenon specific, typically involving abdominal wall, common complaint is pain at the incision site at the time of menstruation. It commonly follows obstetrical and gynaecological surgeries. The diagnosis is frequently made only after excision of the diseased tissue. We present here a case of abdominal wall scar endometriosis in a 45year woman who had undergone a caesarean section two years ago. Surgical excision led to the diagnosis of scar endometriosis. The pathogenesis, diagnosis and treatment of this rare condition are discussed.