Tadayoshi Nagashima (長島 忠美, Nagashima Tadayoshi, January 9, 1951 – August 18, 2017) was a Japanese politician who served in the House of Representatives in the Diet (national legislature) as a member of the Liberal Democratic Party.

[1] Born in the village of Yamakoshi, Niigata (now part of the city of Nagaoka), Nagashima graduated the Toyo University.

He served as mayor of his hometown Yamakoshi between 2000 and 2005, the year the village, severely damaged by an earthquake in 2004, merged with the city of Nagaoka.

Nagashima was elected to the Diet for the first time in 2005.

According to the LDP website, he held the following positions:[2] Nagashima was affiliated to the openly revisionist lobby Nippon Kaigi,[3] and a member of the following right-wing groups in the Diet: Nagashima gave the following answers to the questionnaire submitted by Mainichi to parliamentarians in 2014:[4]