Arnold, Duke of Guelders (c. 1420–1473), was a prominent noble in the Low Countries. He ruled the duchy of Guelders and was known for his efforts to expand his territory and influence during the late Middle Ages. His reign was marked by conflicts with neighboring regions, particularly with the Duchy of Brabant and the County of Holland. Arnold was also involved in the political dynamics of the Burgundian Netherlands, where he sought alliances and engaged in warfare to secure his position. His legacy includes the complex relationships he fostered with other noble houses, which shaped the political landscape of the region during his time.