A case of triple omental torsion in the 17th week of pregnancy is presented. A 29-year old woman, gravida 3, para 2 was admitted to the hospital because of acute right sided, lower abdominal pain. Clinical symptoms suggested acute appendicitis and/or peritonitis. Due to the worsening of abdominal pain and tachycardia the laparatomy was performed. A 15 cm tumor of omentum twisted around its pedicle was found. It must be stressed that the correct diagnosis was made only after laparotomy. The omentum and appendix were excised. Further postoperative course and pregnancy was uneventful and the woman delivered at term. Clinical difficulties with the correct preoperative diagnosis of this rare entity are discussed.