Gelderland (Dutch: [ˈɣɛldərlɑnt] (listen)), also known as Guelders () in English, is a province of the Netherlands, occupying the centre-east of the country. With a total area of 5,136 km2 (1,983 sq mi) of which 173 km2 (67 sq mi) is water, it is the largest province of the Netherlands. Gelderland shares borders with six other provinces (Flevoland, Limburg, North Brabant, Overijssel, South Holland and Utrecht) and the German state of North Rhine-Westphalia.
The capital is Arnhem (pop. 159,265); however, Nijmegen (pop. 176,731) and Apeldoorn (pop. 162,445) are both larger municipalities. Other major regional centres in Gelderland are Ede, Doetinchem, Zutphen, Harderwijk, Tiel, Wageningen, Zevenaar, and Winterswijk. Gelderland had a population of 2,084,478 as of November 2019.