Otto Linné Erdmann (11 April 1804 – 9 October 1869) was a German chemist.

He was the son of Karl Gottfried Erdmann, the physician who introduced vaccination into Saxony.

This office he held until his death, which happened at Leipzig on 9 October 1869.

He was particularly successful as a teacher, and the laboratory established at Leipzig under his direction in 1843 was long regarded as a model institution.

With R. F. Marchand (1813–1850) he also carried out a number of determinations of atomic weights.