产后流血（英语：Postpartum hemorrhage，缩写为PPH），又称产后出血（Postpartum bleeding），妇女在生产之后可能出现的一种失血病症，通常被定义为生产后24小时内失血超过500至1000毫升，或再加上低血容的症状与征象。症状与征象首先包括心跳加快、站立时感觉昏厥、以及呼吸速度增加。若失血量增多，则可能会有寒冷的感觉、低血压、不安定感或失去意识 。在生产后6周内，产后出血的情形都可能会发生 。

Postpartum bleeding or postpartum hemorrhage (PPH) is often defined as the loss of more than 500 ml or 1,000 ml of blood within the first 24 hours following childbirth. Some have added the requirement that there also be signs or symptoms of low blood volume for the condition to exist. Signs and symptoms may initially include: an increased heart rate, feeling faint upon standing, and an increased breath rate. As more blood is lost the women may feel cold, their blood pressure may drop, and they may become restless or unconscious. The condition can occur up to six weeks following delivery.