George Barger FRS (4 April 1878 – 5 January 1939) was a British chemist.
He was born to an English mother and Dutch father in Manchester, England. He was educated at The Hague High School and King's College, Cambridge. His main work focused on the study of alkaloids and investigations of simple nitrogenous compounds of biological importance. Barger identified tyramine as one of the compounds responsible for the biological activity of ergot extracts. He also made significant contributions to the synthesis of thyroxine. and vitamin B1
Barger was elected a Fellow of the Royal Society in May, 1919 and awarded their Davy Medal in 1938.
Barger was married in 1904 and had two sons and one daughter. He died at Aeschi, Switzerland.
- Regius professor of chemistry, University of Glasgow, 1938–1939
- Professor of chemistry in relation to medicine, University of Edinburgh, 1919–1937
- Professor of chemistry, Royal Holloway College, University of London, 1913–1914
- Head of Chemical Department, Goldsmiths' College, 1909–1913
- Fellow of King's College, Cambridge, 1903–1909
- Britons discover synthetic thyroxin, T.R. Ybarra, New York Times, Sunday 12 December 1927