Seraing is a Walloon municipality of Belgium in Province of Liege. The municipality of Seraing includes the old communes of Boncelles, Jemeppe-sur-Meuse, and Ougrée. With Liège, Herstal, Saint-Nicolas, Ans, and Flémalle it forms the greater Liège agglomeration (600,000 inhabitants). To the south of Seraing are the Condroz, followed by the Ardennes region.

In addition to its steel factories, Seraing counts a famous crystal manufacture at Val Saint Lambert, which has been operating on the site of an old Cistercian abbey since 1826. The site of the Arcelor steel company, previously known as Cockerill-Sambre, is the former summer residence of the prince-bishops of Liège.

Several skeletons, potshards, weapons, and jewels were discovered here, dating from the 5th and 6th century, attesting to Seraing being inhabited in Frankish times. The first mention of Saran dates from 956, when a Carolingian farming domain extending on both sides of the Meuse River and owned by someone named Saran was donated to the abbey of Sint-Truiden. The whole territory soon passed to the Bishopric of Liège. In the 11th century, Prince-Bishop Henri I of Verdun used a house in Seranus to entertain guests. Throughout the Middle Ages, the inhabitants of Seraing owed allegiance to Liège, pledging to defend the fluvial approach to the city in case of invasion, in exchange for tax exonerations. The first wooden bridge across the river, which replaced the ferry, was built in 1381.