Richard Johann Kuhn (German pronunciation: [ˈʁɪçaʁt ˈkuːn] ⓘ; 3 December 1900 – 31 July 1967) was an Austrian-German biochemist who was awarded the Nobel Prize in Chemistry in 1938 "for his work on carotenoids and vitamins".

He finished his chemistry studies at University of Munich and received his doctoral degree in 1922 with Richard Willstätter for a scientific work on enzymes.

After graduating, Kuhn continued his scientific career, first in Munich, then at the ETH Zurich and from 1929 onwards at the University of Heidelberg, where he was head of the chemistry department beginning in 1937.

Kuhn's areas of study included: investigations of theoretical problems of organic chemistry (stereochemistry of aliphatic and aromatic compounds; syntheses of polyenes and cumulenes; constitution and colour; the acidity of hydrocarbons), as well as extensive fields in biochemistry (carotenoids; flavins; vitamins and enzymes).

Even though the question of whether Kuhn was a convinced National Socialist or just a career-oriented camp follower is not fully answered, he undisputably supported the Nazi-regime in administrative and organizational ways, especially by his scientific work.