Georg Wahlenberg was a Swedish naturalist. He was born in Kroppa, Värmland County.
Wahlenberg matriculated at Uppsala University in 1792, received his doctorate in Medicine in 1806, was appointed botanices demonstrator in 1814, and professor of medicine and botany in 1829, succeeding Carl Peter Thunberg. He was the last holder of the undivided chair that in the previous century had been held by Linnaeus. After his death in 1851, the chair was divided into more delimited professorships, and botany became the main duty of the borgströmian professorship, at the time held by Elias Fries.
Wahlenberg made his main work in the field of plant geography and published, among other things the Flora lapponica and other works on the plant world of northernmost Sweden. He was among the first major scholars to contribute to the plant taxonomy and geography of the High Tatras in the Habsburg Monarchy where he carried out research in 1813. Two of the highest mountain lakes in the Tatras, now in Slovakia, are named Upper Wahlenberg Tarn and Lower Wahlenberg Tarn in his memory.
Wahlenberg was elected a member of the Royal Swedish Academy of Sciences in 1808.