Keishu Tanaka (?? ??, Tanaka Keishu, born March 6, 1938) is a Japanese politician, serving in the House of Representatives in the Diet (national legislature) as a member of the Democratic Party of Japan.
A native of Soma District, Fukushima and graduate of Tokai University, he was elected for the first time in 1983.
He was Minister of Justice under Prime Minister Yoshihiko Noda from October 1 to October 23, 2012 before resigning due to scandals over financial donations and organized crime links.