Jean-Charles Laveaux (17 November 1749, Troyes – 15 March 1827, Paris) was a French grammarian and translator.
Also a journalist, an historian and translator, he wrote several dictionaries among which his Dictionnaire synonymique and his Dictionnaire raisonné des difficultés grammaticales et littéraires left a mark in the history of French lexicography.
After studying at Troyes and Paris, Jean-Charles Laveaux was teacher of French in Basel, then professor of French literature in Stuttgart and Berlin, where Frederick the Great invited him to participate in historical work on the Prussian monarchy.
Back in France in 1791, he headed the political and literary newspaper Le Courrier de Strasbourg, then moved a year later to Paris where he was editor of the Journal de la Montagne during the reign of Terror. After several stays in prison, he left politics and became professor of ancient languages and office manager at the prefecture of the Seine under the Consulate and inspector general of prisons and asylums of the Seine under the Empire, a post he was deposed of at the Bourbon Restoration.