Ivan Nikolayevich Nazarov (Russian: Иван Николаевич Назаров; 12 June 1906, Koshelevo – 30 July 1957, Avignon) was a Soviet organic chemist.

He started his scientific activities in 1931 at Leningrad State University. Nazarov published more than 300 scientific papers. In 1946, he was elected as a Corresponding Member of the Academy of Sciences of the Soviet Union, and in 1953 he became an academician. The Nazarov cyclization reaction is named after him.

• Krasnaya, Zh. A.; Torgov, I. V.; Prostakov, N. S. (2006). "An outstanding organic chemist of the 20th century". Herald of the Russian Academy of Sciences. 76 (4): 370. doi:10.1134/S1019331606040083. S2CID 140821432.
• "Ivan Nikolaevich Nazarov". Bulletin of the Academy of Sciences of the USSR Division of Chemical Science. 6 (10): 1177–1178. 1958. doi:10.1007/BF01167383.