The Derby du Nord (French pronunciation: ​[døbi du nɔʁ], Northern Derby) is a football match contested between French clubs RC Lens and Lille OSC, two of region's most successful clubs. The derby has the name despite Lille being the only club of the two situated in the department of Nord. Lens are situated in the western department of Pas-de-Calais. The name can also refer to matches involving Lille and Valenciennes as both clubs are located within Nord, however, the match historically refers to matches involving Lille and Lens. As a result, the Lille–Valenciennes match is sometimes referred to as Le Petit Derby du Nord.