Wailly-Beaucamp (French pronunciation: [waji bokɑ̃]) is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.

The inhabitants of Wailly-Beaucamp are known as Wailly-Beaucampiens.

Wailly-Beaucamp is situated 6 km (3.7 mi) south of Montreuil-sur-Mer, 15 km (9.3 mi) east of Berck-sur-Mer and 20 km (12 mi) from Le Touquet, on the plateau between the valleys of the Canche and the Authie. The town is crossed by the former Route-Nationale 1 (N1) linking Boulogne-sur-Mer to Paris and is served by junction 25 of autoroute A16. Nearby towns and villages include: Boisjean, Lépine, Verton, Airon-Saint-Vaast, Campigneulles-les-Grandes, Campigneulles-les-Petites and Ecuires. The nature of the local geology lends itself to sand and gravel extraction.

We don't really know the origin of the name Wailly. Place-names in France were subject to intensive research during the 19th century. Wailly didn't escape the investigations. Here are some hypotheses:

Walliacum, is Galliacum, caused by mutation of W to G. 'Gallus ->Gaullois, Wailly being a border village of Picardy and therefore, of France.

The changing spellings of the name Wailly :

There's no mention of Wailly before 1143. A certain Wermon, lord of Wailly, signed as witness at the bottom of a map, in 1144. This was the first mention of a village called Wailly, near Montreuil.

8 May 1783 : The death of Adrien du Bus who sold the manor-house of Cossette.