Jōō (承応), alternatively romanized as Jō-ō or Shōō, was a Japanese era name (年号,, nengō,, lit. "year name") after Keian and before Meireki. This period started in September 1652 and ended in April 1655. During this time, the emperors were Go-Kōmyō-tennō (後光明天皇) and Go-Sai-tennō (後西天皇).