Harold Raistrick (November 26, 1890 – March 8, 1971) was a British biochemist, Fellow of the Royal Society, and recipient of the Bakerian Medial.
In the 1920s, Raistrick worked as a researcher for Imperial Chemical Industries and later directed the Division of Biochemistry and Chemistry at the London School of Hygiene and Tropical Medicine.
Originally intended to spend time in the laboratory of Emil Fischer in Berlin, Raistrick, who was ineligible to serve during the First World War due to a physical impairment, instead went to study in Cambridge.
During this period, Raistrick was also involved in then-confidential research for the government, in collaboration with Dorothy Jordan Lloyd, on acetone-butanol fermentation, which was valuable as an alternative method for producing acetone for explosives.
In 1921, Raistrick was hired to lead a newly formed department of applied biochemistry for Nobel's Explosives Company, where he continued research into the production of useful chemicals by fermentation.