Kelmis (in French, La Calamine) is a municipality located in the Belgian province of Liège. On January 1st, 2004 Kelmis had a total population of 10,144 (4,950 males and 5,194 females). The total area is 18.12 km² which gives a population density of 559.77 inhabitants per km².

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