Jōō (承応) was a Japanese era name after Keian and before Meireki and spanned from 1652 to 1655. Reigning emperors were Go-Komyo and Go-Sai.

There is another era with the same pronunciation but different kanji (貞応)

Change of Era

To mark the death of the third Shōgun, Tokugawa Iemitsu, on the 18th day of the ninth month of Keian 5 (1652), the era became Jōō (承応, "Receiving answers"?)

Source of name

From the Book of the Jin, 夏商承運、周氏応期

Jo'o	1st	2nd	3rd	4th
Gregorian	1652	1653	1654	1655

ja:承応