David Nachmansohn (17 March 1899 – 2 November 1983) was a German-Jewish biochemist responsible for elucidating the role of phosphocreatine in energy production in the muscles, and the role of the neurotransmitter acetylcholine in nerve stimulation. He is also recognised for his basic research into the biochemistry and mechanism underlying bioelectric phenomena. David Nachmansohn was elected member of Leopoldina in 1963 and became a member of the National Academy of Sciences (USA) in 1965. He was made an Honorary Fellow of the Weizmann Institute in 1972.