Johan Gottlieb Gahn (19 August 1745 – 8 December 1818) was a Swedish chemist and metallurgist who isolated manganese in 1774.

[1] Gahn studied in Uppsala from 1762 to 1770 and became acquainted with chemists Torbern Bergman and Carl Wilhelm Scheele.

[2] 1770 he settled in Falun, where he introduced improvements in copper smelting, and participated in building up several factories, including those for vitriol, sulfur and red paint.

He was very reluctant to publish his scientific findings himself, but freely communicated them to Bergman and Scheele.

In 1784, Gahn was elected a member of the Royal Swedish Academy of Sciences.