Roald Hoffmann (born July 18, 1937) is an American theoretical chemist who won the 1981 Nobel Prize in Chemistry. He currently teaches at Cornell University in Ithaca, New York.

Hoffmann graduated in 1955 from New York City's Stuyvesant High School, where he won a Westinghouse science scholarship. He received his Bachelor of Arts degree at Columbia University (Columbia College) in 1958. He earned his Master of Arts degree in 1960 from Harvard University.
He earned his Doctor of Philosophy degree from Harvard University while working under direction of subsequent 1976 chemistry Nobel Prize winner William N. Lipscomb, Jr. Under Lipscomb's direction the Extended Huckel method was developed by Lawrence Lohr and by Roald Hoffmann.
Hoffmann has investigated both organic and inorganic substances, developing computational tools and methods such as the extended Hückel method, which he proposed in 1963.
In 1981, Hoffmann received the Nobel Prize in Chemistry, which he shared with Kenichi Fukui.

Priestley Medal

Arthur C. Cope Award in Organic Chemistry
Organic Chemistry Award (American Chemical Society), 1969
Inorganic Chemistry Award (American Chemical Society), 1982
Pimentel Award in Chemical Education (1996)
Award in Pure Chemistry
Monsanto Award
Literaturpreis of the Verband der Chemischen Industrie for his textbook "The Same and Not The Same" (1997)