Dame Harriette Chick DBE (6 January 1875 – 9 July 1977) was a British microbiologist, protein scientist and nutritionist.

She was born in London, England as the fifth child of seven daughters and four sons of Samuel Chick and Emma Hooley, a Methodist family.

[6] In 1902 she was appointed as assistant to Dr AC Houston, Chief Bacteriologist to the Royal Commission on Sewage Disposal.

She is known for having formulated Chick's Law in 1908, giving the relationship between the kill efficiency of organisms and contact time with a disinfectant.

[14] In 1915, she briefly went to the Lister Institute in Elstree to test and bottle tetanus antitoxin for the army[15] and to develop the first disinfectants aimed at specific microorganisms.

Subsequently, however, she commenced studies on rectifying nutritional deficiencies in the wartime diets of both the native population and overseas forces.

[17] In 1919, together with Dr. Elsie Dalyell, she led a team, including Margaret Hume and Hannah Henderson Smith, from the Lister Institute and the Medical Research Council (United Kingdom) to study the relation of nutrition to childhood bone disease in post-war Vienna.

[18][19] Chick was appointed Head of a new nutrition section at the Lister Institute and continued with her research on rickets and, additionally, pellagra.