Nikolay Yakovlevich Demyanov
Born	March 27 [ O.S. March 15] 1861 Tver
Died	March 19, 1938(1938-03-19) (aged 77) Moscow
Education	Doctor of Science (1899) Academician of the Russian Academy of Sciences
Alma mater	Imperial Moscow University (1886)
Known for	Demjanov rearrangement
Awards	Lenin Prize (1930)
Scientific career
Fields	Organic chemistry
Thesis	On the action of nitric anhydride and nitrogenous oxide on hydrocarbons of the ethylene series
Doctoral advisor	Vladimir Markovnikov

Nikolay Yakovlevich Demyanov ( Russian: Никола́й Я́ковлевич Демья́нов; March 27 [ O.S. March 15] 1861, Tver – March 19, 1938, Moscow), also known as Demjanov and Demjanow, was a Russian organic chemist and a member of the USSR Academy of Sciences (1929). He is internationally known for the Demjanov rearrangement organic reaction and other discoveries.

He was a recipient of the Lenin Prize in 1930.

• Imperial Moscow University: 1755-1917: encyclopedic dictionary. Moscow: Russian political encyclopedia (ROSSPEN). 2010. pp. 212–213. ISBN  978-5-8243-1429-8.

• (in Russian) Academician Nikolay Yakovlevich Demyanov