Wervicq-Sud (French pronunciation: [wɛʁvik syd]; Dutch: Zuid-Wervik) is a commune in the Nord department of northern France,[3] near the border with Belgium.

For centuries, Werviq-Sud and Wervik were one unified settlement and belonged to the County of Flanders, an autonomous but tributary principality to French kings.

It wasn't until 1713 that Werviq-Sud was finally separated from Wervik when the Treaty of Utrecht led to the river Lys becoming a border splitting the French and Austrian territories in this area.

Locals, together with those in nearby Bousbecque and a small number from Comines, demanded reunification with their Belgian counterparts on the other side of the Lys.

In World War II it was integrated into the Military Administration in Belgium and Northern France and reunited with its Belgian counterpart Wervik.