Emperor Go-Fukakusa (後深草天皇 Go-Fukakusa-tennō) (28 June 1243 – 17 August 1304) was the 89th emperor of Japan, according to the traditional order of succession. This reign spanned the years 1246 through 1260.
This 13th-century sovereign was named after the 9th-century Emperor Ninmyō and go- (後), translates literally as "later", and thus he could be called the "Later Emperor Fukakusa". The Japanese word go has also been translated to mean the "second one"; and in some older sources, this emperor may be identified as "Fukakusa, the second", or as "Fukakusa II".
Before his ascension to the Chrysanthemum Throne, his personal name (his imina) was Hisahito (久仁).
Although the Roman-alphabet spelling of the name of this 13th-century emperor is the same as that of the personal name of a current member of the Imperial family, the kanji are different:
- Emperor Go-Fukakusa, formerly Prince Hisahito (久仁)
- Prince Hisahito of Akishino (悠仁)
He was the second son of Emperor Go-Saga.