Igor Igorevich Wagner (Russian ???? ???????? ??????, sometimes Georg Wagner or Egor Vagner; 9 December 1849, in Kazan – 27 November 1903, in Warsaw) was a Russian chemist.
Wagner's father was German-born lawyer and civil servant while his mother came from the Russian Aristocracy.
He began studying law in 1867 at the University of Kazan, but later switched to chemistry under the influence of Alexander Mikhaylovich Zaytsev.
Zaytsev had made Kazan into a center of organic chemistry in Russia and many of his students became professors.
Wagner received his chemistry degree in 1874 and received a two-year scholarship to prepare for becoming a professor.
He stayed with Saizev for a year in Kazan and spent a year with Butlerov at the University of Saint Petersburg.
After that he was assistant professor in Saint Petersburg until 1882 and then professor at the Forestry and Agricultural Institute in Pulawy near Lublin, where he set up a laboratory for organic chemistry.
He became the first professor of organic chemistry in 1886 at the University of Warsaw, but moved in 1889 to the newly founded Polytechnic in Warsaw, where he was Professor of Organic Chemistry and Dean of the Faculty of Chemistry.
The Wagner-Meerwein rearrangement reaction is named after Wagner and Hans Meerwein.
Wagner proposed that Bornyl chloride undergoes an internal rearrangement to form pinene.
This type of rearrangement was then generalized by Meerwein.