Haruo Hosoya (Japanese: 細矢 治夫, Hepburn: Hosoya Haruo, born 1936) is a Japanese chemist and emeritus professor of Ochanomizu University, Tokyo, Japan.
[1] Hosoya was born in Kamakura, Japan to a family of an office worker.
In 1964 he wrote his Ph.D. thesis, "Study on the Structure of Reactive Intermediates and Reaction Mechanism".
[2] The Hosoya index is often used in computer (mathematical) chemistry investigations for organic compounds.
In 2002-2003 the Internet Electronic Journal of Molecular Design dedicated a series of issues to commemorate the 65th birthday of professor Hosoya.