Masashi Goto (Japanese: 後藤政志, Gotō Manashi, born 1949) is a Japanese nuclear engineer, author, activist and commentator on the Fukushima Daiichi nuclear disaster.^[1]

He is the designer of the nuclear reactor vessels owned by Toshiba, where he worked from 1989 to 2009.^[2] His designs include the containment buildings of Kashiwazaki-Kariwa Nuclear Power Plant (Units 3 and 6),^{[citation needed]} Hamaoka Nuclear Power Plant (Units 3 and 4)^{[citation needed]} and Onagawa Nuclear Power Plant (Unit 3)^{[citation needed]}. Toshiba manufactured four of the six reactors the Fukushima Daiichi nuclear power plant in the 1970s.^[2] He rose to public prominence on 14 March 2011 by being the first "insider" (Note: he retired from Toshiba in 2009^[2]) addressing the press at the Foreign Correspondents' Club of Japan, three days after the Fukushima Daiichi nuclear disaster.^{[2][3][4][5][6][7]}

Since then, he became a regular commentator and featured as an expert in hearings regarding the nuclear disaster at Japan's Nuclear and Industrial Safety Agency and House of Councillors. From April 2013,^{[citation needed]} he joined as an expert on the Citizen's Commission on Nuclear Energy, a think tank composed of professors of public policy.^[8]

He obtained a Doctor of Engineering in Tokyo Institute of Technology in 2005. After retirement from Toshiba in 2009, he was a lecturer on nuclear engineering in Waseda University, Tokyo City University, Shibaura Institute of Technology and Kokugakuin University.

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