Empress Kōjun of Japan (d. 2000)
Empress Kōjun (香淳皇后, Kōjun-kōgō), born Princess Nagako (良子女王, Nagako Joō, 6 March 1903 – 16 June 2000), was a member of the Imperial House of Japan, the wife of Emperor Shōwa (Hirohito) and the mother of Shigeko Higashikuni, Princess Sachiko Hisa-nomiya, Kazuko Takatsukasa, Atsuko Ikeda, the Emperor Emeritus Akihito, Prince Masahito Hitachi-nomiya and Takako Shimazu.

Her posthumous name is Kōjun (香淳), which means "fragrant purity". Empress Kōjun was empress consort (皇后 kōgō) from 25 December 1926 to 7 January 1989, making her the longest-serving empress consort in Japanese history.