Tsutomu Nishioka (西岡 力, Nishioka Tsutomu, born 1956 in Tokyo) is a professor of International Christian Studies at Tokyo Christian University. He specializes in Japan-Korean relations, South Korea/North Korea Studies. His research focuses on the Comfort women and the North Korean abductions of Japanese citizens. He is a chairman of the National Association for the Rescue of Japanese Kidnapped by North Korea (NARKN).
He was accused of defamation on January 9, 2015 by a former Asahi Shimbun reporter Takashi Uemura who wrote articles on the comfort women issue in 1991.
He was graduated from Tokyo Christian University in 1979 and earned master's degree in International Area Studies from graduate school of University of Tsukuba in 1983. He studied at the International Division in Yonsei University from 1977-1978. He worked at the Embassy of Japan in South Korea as a special researcher of Ministry of Foreign Affairs from 1982-1984. He was an Editor in Chief of Gendai Korea (Today's Korea) journal from 1990-2002.
Nikkan Gokai No Shin’en (日韓誤解の深淵, The Abyss of Japan-South Korean Misunderstanding), Akishobo, (1992) ISBN 4750592129
Koria Tabū O Toku (コリア・タブーを解く, Solving the Korea Taboo), Akishobo, (1997) ISBN 4750597031
Yami Ni Idomu: Rachi, Kiga, Ianfu, Han-Nichi O Dō Haaku Suru Ka (闇に挑む!―拉致、飢餓、慰安婦、反日をどう把握するか, Deciphering the Darkness: Abductions, Starvation, Comfort Women and the Anti-Japan Movement), Tokuma Shoten, (1998) ISBN 4198909709
Boso suru kokka, Kita-Chosen (暴走する国家・北朝鮮――核ミサイルは防げるのか), Tokuma Shoten, (1999) ISBN 4198911444
Kin Sei-nichi ga shikaketa "Tainichi daiboryaku" Rachi no Shinjitu (金正日が仕掛けた「対日大謀略」拉致の真実), Tokuma Shoten, (2002) ISBN 4198615977
KinSei-nichi to Kin Dai-chu (金正日と金大中――南北融和に騙されるな!), PHP Institute, (2000) ISBN 4569612687
Tero kokka, Kita-Chosen ni damasareruna (テロ国家・北朝鮮に騙されるな, PHP Institute, (2002) ISBN 4569624413
Kita-Chosen ni torikomareru Kankoku (北朝鮮に取り込まれる韓国――いま"隣国"で何が起こっているか), PHP Institute, (2004) ISBN 4569634680
Nikkan “Rekishi Mondai” no Shinjitsu (日韓「歴史問題」の真実――「朝鮮人強制連行」「慰安婦問題」を捏造したのは誰か. The Truth About the Japan-South Korea History Issue), PHP Institute, (2005) ISBN 4569643167
Kita-Chosen no "Kaku", "Rachi" ha kaiketsudekiru (北朝鮮の「核」「拉致」は解決できる), PHP Institute, (2006) ISBN 4569656315
Rachi kazoku tono rokunen senso (拉致家族との6年戦争――敵は日本にもいた!), Fusosha Publishing, (2002) ISBN 4594038190
Kankoku bunretsu (韓国分裂――親北左派vs韓米日同盟派の戦い), Fusosha Publishing, (2005) ISBN 4594050166
Kiga to misairu (飢餓とミサイル――北朝鮮はこれからどうなるのか), Sōshisha, (1998)ISBN 479420857X
Yoku Wakaru Ianfu Mondai (よくわかる慰安婦問題, The Comfort Women Issue Decoded), Sōshisha, (2007) ISBN 9784794216014
Yoku Wakaru Ianfu Mondai :Zōho Shimpan (文庫よくわかる慰安婦問題増補新版, The Comfort Women Issue Decoded, Revised Edition), Sōshisha, (2012) ISBN 4794219423
