Cassel (from Flemish; Kassel in modern Dutch spelling) is a commune in the Nord départment in northern France. Built on a prominent hill overlooking French Flanders, the town has existed since Roman times. It was developed by the Romans into an important urban centre and was the focus of a network of roads, which are still in use today, that converge on the hill. After the fall of the Roman Empire, Cassel became an important fortified stronghold for the rulers of Flanders which was repeatedly fought over before finally being annexed to France in the 17th century. It was the headquarters of Marshal Ferdinand Foch during part of the First World War. In 1940, during the German invasion of France, Cassel was the scene of a fierce three-day battle between British and German forces which resulted in much of the town being destroyed.

Today the town, which was rebuilt following the war, is a popular destination for visitors to French Flanders. It is renowned for its extensive views from the summit of Mont Cassel and is the location of the Nord départment's principal museum of local art, history and folklore. It is also the home of the legendary giants Reuze-Papa and Reuze-Maman, which are paraded in effigy each Easter during the town's annual carnival.

The town of Cassel is situated at the top of Mont Cassel (Dutch: Kasselberg), a prominent hill located in the local Houtland region about 30 kilometres (19 mi) from the sea. The hill rises to a height of 176 metres (577 ft) above sea level. Its geological composition comprises limestone capped with a very hard ferruginous layer of rock.

The hill of Mont Cassel was occupied during the late Iron Age by the Menapii, a Belgic tribe, who made it the capital of a large territory extending from modern Calais to as far as the Rhine. The hilltop was probably used as an oppidum or hill fort. The Menapii fought against Julius Caesar but were forced to submit to Rome in 53 BC. They rebelled along with their neighbours, the Morini, in 30 or 29 BC. The Roman governor of Gaul, Carrinas, successfully quelled the rebellion and the territory of the Menapii was subsequently absorbed into the Roman province of Gallia Belgica. Cassel was redeveloped as Castellum Menapiorum, the urban centre or civitas of the Menapii; the modern town takes its name from the Roman settlement.

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