Serous cystadenoma is the most common type of epithelial neoplasms and it’s rare among adolescents or association with pregnancy. We report the occurrence of a rare case of a huge benign ovarian Serous cystadenoma with pregnancy had an uncomplicated vaginal delivery and treated after six weeks postpartum by complete laparoscopic extirpation of a giant ovarian cyst. Pregnant women with giant ovarian cysts can be delivered vaginally unless obstructed or obstetrical indications for cesarean sections. Giant ovarian cysts can be managed laparoscopically after postpartum period regardless of the size of the cyst when benign imaging appearance and torsion ruled out.