Marchin (French pronunciation: [maʁʃɛ̃]; Walloon: Mårcin) is a municipality of Wallonia located in the province of Liège, Belgium. On January 1, 2006, Marchin had a total population of 5,114. The total area is 30.00 km² which gives a population density of 170 inhabitants per km². The municipality consists of the following districts: Marchin, and .