Ryoichi Nakagawa (中川 良一, Nakagawa Ryōichi, 1913–1998) was a Japanese aircraft/automotive engineer. He graduated from Tokyo Imperial University in 1936 and joined Nakajima Aircraft Company in the same year.
^Nakagawa, Ryoichi (1982-02-05), "航空機から自動車へ : 一内燃機関技術者の回想" [From Aircraft To Automobile ― Memoirs of an Engine Designer], Journal of the Japan Society of Mechanical Engineers (in Japanese), 85 (759), The Japan Society of Mechanical Engineers (JSME): 214–220, doi:10.1299/jsmemag.85.759_214
^Maema, Takanori (July 2007), 悲劇の発動機「誉」 : 天才設計者中川良一の苦闘 [Homare, the Engine of Tragedy – the Anguish of Genius Engine Designer, Ryoichi Nakagawa] (in Japanese), Soshisha Publishing Co., Ltd., ISBN978-4-7942-1513-0
^Ikari, Yoshirō (1993-03-14), "傑作発動機‶誉"設計主務者の横顔 [Profile of the chief designer of the masterpiece ‶Homare" engine ]", 彩雲・零水偵 [Saiun/Type 0 Reconnaissance], Mechanic of World Aircraft (in Japanese), vol. 3, Koujinsha, p. 28, ISBN4-7698-0633-7
^ abcKatsuragi, Yoji (2003), "The Beam of Light of Prince Motor Company", Grand Prix Book Publishing Co., Ltd., (Japanese) ISBN4-87687-251-1