Keiko Nagaoka (永岡 桂子 Nagaoka Keiko, born December 8, 1953) is a Japanese politician serving in the House of Representatives in the Diet (national legislature) as a member of the Liberal Democratic Party. A native of Tokyo and graduate of Gakushuin University she was elected for the first time in 2005. Her husband was politician Yoji Nagaoka, who committed suicide on August 1, 2005.
- 政治家情報 〜永岡 桂子〜. ザ･選挙 (in Japanese). JANJAN. Archived from the original on 2007-12-03. Retrieved 2007-10-08.