Geldermalsen is a municipality and a town in the western Netherlands. The municipality of Geldermalsen was formed on the 1 January 1978 when the former municipalities of Beesd, Buurmalsen, Deil and Geldermalsen were joined. The new municipality with an area of km2 is one of the largest municipalities in the Western Betuwe. The municipality had a population of in . They all live in the eleven villages that form Geldermalsen.