François Charles Léon Moureu (19 April 1863, in Mourenx – 13 June 1929, in Biarritz) was a French pharmacist and chemist.
From 1884 to 1891 he studied at the École supérieure de Pharmacie in Paris, receiving his doctorate in physical sciences in 1893. From 1891 to 1907 he worked as chief pharmacist at the Asiles de la Seine, during which time, he obtained his agrégation (1899).
From 1907 onward, he was a professor of chemical pharmacy at the École supérieure de Pharmacie in Paris, and in 1913 was named director of the laboratory of hydrological physical chemistry at the École pratique des hautes études. In 1917 he was appointed professor of organic chemistry at Collège de France.
He was a member of the Académie Nationale de Médecine (from 1907), Académie des sciences (1911–29) and Académie nationale de pharmacie (president 1913).
He is best known for his pioneer studies of antioxidants; his research leading to the use of antioxidants in the rubber and vegetable oil industries. In 1893 he was the first to synthesize acrylonitrile.
In 1910 he published Notions fondamentales de chimie organique, a book that was translated into English as Fundamental principles of organic chemistry (1921). Other noted works by Moureu are: