Seraing (French pronunciation: [səʁɛ̃] ⓘ; Walloon: Serè) is a city and municipality of Wallonia located in the province of Liège, Belgium.

In addition to its steel factories, Seraing is home to the crystal manufacture Val Saint Lambert, which has been operating on the site of an old Cistercian abbey since 1826.

Several skeletons, potshards, weapons, and jewels were discovered here, dating from the 5th and 6th century, attesting to Seraing being inhabited in Frankish times.

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.

Over the next decades, many more metallurgical plants and foundries were built in this area, which became an integral part of Wallonia's industrial backbone, the sillon industriel.