Gelderland (Dutch pronunciation: [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 by land area, and second by total area. 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. It contains the Netherlands's largest forest region (the Veluwe), the Rhine and other major rivers, and a significant amount of orchards in the south (Betuwe).