town, Eure-et-Loir département, Centre région, north-central France. It lies along the Blaise River, northwest of Chartres. Known to the Romans as Drocae, it was held by the Durocasses, a Gallic tribe. It gave its name to a medieval family of counts. François, Duke de Guise, defeated the Huguenots there in 1562, marking the beginning of the Wars of Religion. The town's monuments include Le Beffroi, or old town hall (1512–37); the Gothic Church of Saint-Pierre (13th–17th century); and the 19th-century Chapel of Saint-Louis (a mausoleum for the princes of the Orléans family).

Dreux expanded rapidly as an industrial centre from the early 1960s largely as a result of Parisian firms decentralizing. The town's proximity to the capital has ensured its growth as an industrial and commercial centre. Industries include electronics, chemicals, metallurgy, and automobile components. Business services have grown in recent years. Pop. (1999) 31,849; (2005 est.) 32,200.