Nils Johan Berlin (Nils Johannes Berlin) (18 February 1812 – 27 December 1891) was a Swedish chemist and physician, who held various professorships at the University of Lund from 1843 to 1864.
Berlin was the first chemist who took the initiative to write a textbook for elementary science.
He also studied the newly-discovered rare earths, separating yttrium and erbium.
Berlin was a member of the Royal Swedish Academy of Sciences from 1844 onwards.
The mineral Berlinite (AlPO4) is named after him.