Georgij Karlowich Kreyer (Russian: Гео́ргий Ка́рлович Кре́йер, romanized: Georgy Karlovich Kreyer; November 26, 1887 – January 11, 1942) was a Russian and Soviet botanist and mycologist (lichenologist) born in Saint Petersburg.
Between 1908 and 1910, he made extensive collections of lichens in the Mogilev Region of Belarus, between Orsha and Syanno, in the neighbourhood of the settlements of Smolyany, Bobromynichi (Vitebsk Region) and Selets.
[2] Examples of names published Atropa caucasica Kreyer.
)[3] Kreyer is commemorated in the name of the plant species Valeriana kreyeriana Sumnev.
[4] Kreyer was the editor of the 1913 work on fungi Mycota (180 pages) reissued in 1915.