Government of Japan
The Current Emperor of Japan (今上天皇) is Akihito. He was officially enthroned on November 12, 1990. He is styled as "His Imperial Majesty" (天皇陛下), and his reign bears the era name of Heisei (平成). Naruhito, the Crown Prince of Japan, is the heir apparent to the Chrysanthemum Throne.
Emperor of Japan
Outside Japan, the previous Emperor is usually called Hirohito in English, although he was never referred to as Hirohito in Japan, and was renamed "Shōwa Tennō" after his death, which is the only name that Japanese speakers currently use when referring to him.