Azuma Koshiishi (輿石 東 Koshiishi Azuma, born May 14, 1936) is a Japanese politician of the Democratic Party of Japan, a member of the House of Councillors in the Diet, and general secretary of the ruling Democratic Party of Japan. A native of Nirasaki, Yamanashi and graduate of Tsuru University, he was elected to the House of Representatives of Japan in 1990, where he served for two terms until 1996 when he failed to be re-elected. He was elected to the House of Councillors for the first time in 1998.