Otto Karl Berg (15 August 1815 in Stettin – 20 November 1866 in Berlin) was a German botanist and pharmacist.
He was the son of Johann Friedrich and Wilhelmine Friederike Berg.
[1] In 1848, he married Caroline Albertine Florentine Witthaus, with whom he had six children.
[2] He joined the faculty of Botany and Pharmacology at the University of Berlin in 1849, where he specialized in South American flora.
In 1862 he was appointed associate professor, and during his time in that position, he helped to make an independent discipline of pharmacology.