- In this Japanese name, the family name is Yamaguchi.
Otoya Yamaguchi (山口二矢, Yamaguchi Otoya, February 22, 1943-November 2, 1960) was a Japanese political activist and assassin. He killed Inejirō Asanuma, the head of the Japanese Socialist Party (JCP). On October 12, 1960, the killing was broadcast live by NHK television.