Kenji Kosaka (小坂 憲次, Kosaka Kenji, 12 March 1946 – 21 October 2016) was a Japanese politician.

[2][3] His father is Zentaro Kosaka, also a politician.

[4] Kenji Kosaka received a law degree from Keio University in 1968.

[3] Returning to Japan, he became secretary to Prime Minister Yasuhiro Nakasone in 1986.

[3] Kenji Kosaka is affiliated to the openly revisionist lobby Nippon Kaigi.