Kensei Hasegawa (長谷川 憲正, Hasegawa Kensei, born January 1, 1943) is a Japanese politician of the People's New Party, a member of the House of Councillors in the Diet (national legislature). A native of Kumagaya, Saitama and graduate of the University of Tokyo, he worked at the Ministry of Posts and Telecommunications from 1967 to 2003. He was elected for the first time in 2004.

• 政治家情報 〜長谷川 憲正〜. ザ･選挙 (in Japanese). JANJAN. Archived from the original on 2007-12-08. Retrieved 2007-11-17.

• Official website in Japanese.