Naoki Tanaka (田中 直紀) is a former Japanese politician of the Democratic Party of Japan, who served as a member of the House of Councillors in the Diet (national legislature), from Niigata Prefectural electorate. He is a native of Kanazawa, Ishikawa and a graduate of Keio University. When he married Makiko Tanaka he changed his family name to hers. He was elected to the House of Representatives for the first time in 1983. After losing his seat in 1996, he was elected to the House of Councillors for the first time in 1998.