Vaginal stenosis, or gynetresia, commonly results from a congenital defect, while acquired gynetresia is a rare condition. Reported contributors to acquired gynetresia include chronic graft-versus-host reaction, radiotherapy for gynecologic malignancies, female genital mutilation, postpartum foreign body insertion, or chemical insertion. We report a case of postpartum gynetresia, that was attributed to neither a foreign body nor chemicals. A 33-year-old Korean primigravid woman was referred to our hospital in hypovolemic shock due to postpartum bleeding caused by an actively bleeding vaginal laceration identified on pelvic examination. Primary repair of the vaginal laceration followed by embolization were performed. Four weeks later, postpartum gynetresia was identified on the pelvic examination. Adhesiolysis by blunt finger dissection was performed and a vaginal mold was inserted along with vaginal estrogen capsules. The vaginal mucosa was healed in four weeks.