Tienen is a city and municipality in the province of Flemish Brabant, in Flanders, Belgium. The municipality comprises Tienen itself and the towns of Bost, Goetsenhoven, Hakendover, Kumtich, Oorbeek, Oplinter, Sint-Margriete-Houtem and Vissenaken.

Charles-François du Périer Dumouriez was a French military officer, minister of Foreign Affairs, minister of War in a Girondin cabinet and army general during the French Revolutionary War. Dumouriez is one of the names inscribed under the Arc de Triomphe, on Column 3.