Kōan (弘安?) was a Japanese era name (年号,, nengō,?, lit. "year name") after Kenji and before Shōō. This period spanned the years from February 1278 through April 1288. The reigning emperors were Go-Uda-tennō (後宇多天皇?) and Fushimi-tennō (伏見天皇?).
