Kosaburo Eto (江藤 小三郎, Etō Kosaburō, 20 April 1946 – 11 February 1969) was a Japanese nationalist, thinker, social activist, Japan Ground Self-Defense Force official, and member of a leading Japanese political family. He is best known for committing suicide through self-immolation as a nationalist protest in front of the Japanese Houses of Parliament.