Kelmis (in French, La Calamine) is a municipality located in the Belgian province of Liège. On January 1st, 2002 Kelmis had a total population of 10,081 (4,947 males and 5,134 females). The total area is 18.12 km² which gives a population density of 556.35 inhabitants per km².

The territory around the Vieille Montagne zinc mine in Kelmis was semiindependent during 1816-1919 as Neutral Moresnet.