Baron Tanakadate Aikitsu (田中舘 愛橘, September 18, 1856 – May 21, 1952) was a Japanese physicist with diverse interests and effect.

Tanakadate was born in Fukuoka hamlet, in what is now part of the city of Ninohe in the northern Iwate Prefecture, Japan.

[2] In the lead up to the World War II, he advocated directly for Nippon-shiki over Hepburn, eventually resulting in its adoption as the official Romanization standard by the wartime government.

[4] Tanakadate travelled widely in Japan from 1893 to 1896, making a survey of gravity and geomagnetism for geophysical research with Cargill Gilston Knott.

In the Russo-Japanese War, he was an advisor to the Imperial Japanese army on the use of hot air balloons for military reconnaissance purposes.