Croix, town, southwestern suburb of Roubaix, Nord département, Hauts-de-France région, northern France, on the Roubaix Canal and Marque River.The lordship and village of Croix existed before the 12th century and was mentioned in early archives. The Château de la Fontaine (17th century) was a fief of the lordship, which became a countship in 1617.