Baron Maejima Hisoka (前島 密, January 24, 1835 – April 27, 1919), born 上野 房五郎 (Ueno Fusagorō), was a Japanese statesman, politician, and businessman in Meiji-period Japan. Maejima founded the Japanese postal service, and is known as 郵便制度の父 (Yūbin Seido no Chichi), or "Father of the Postal System".