Berthold Stein (1847–1899) was a Polish botanist and lichenologist. After working as a disciple at the Botanical Garden in Berlin in 1865 he became superintendent at the Innsbruck Botanical Garden. He held this position from 1873 to 1880, during which he also started to collect lichens. From 1880 to 1890 he was royal superintendent at the University of Wrocław Botanical Garden. Based on a quote in 1879 by Stein himself he can be considered as a student of G.W. Körber. His main area of interest was the flora of Silesia.