Kōka
| Part of a series on the | 
| History of Japan | 
|---|
Kōka (弘化) was a Japanese era name (年号, nengō, literally "year name") after Tenpō and before Kaei. This period spanned the years from December 1844 through February 1848. The reigning emperors were Ninkō-tennō (仁孝天皇) and Kōmei-tennō (孝明天皇).