Søren Norby, self-styled as Severin Norbi ( 1470 – 1530), was a Danish leading naval officer in the fleets of Danish kings Hans I and Christian II. He commandeered the greatest ship of the Danish fleet in naval wars against Sweden and Lübeck. Norby governed various land possessions in Scandinavia, ruling Gotland from 1517 to 1525. His rebellion against Frederick I of Denmark in 1525 was defeated, and he fled Denmark, ending his life in the employ of Charles V, Holy Roman Emperor.
Norby had two children with unknown women; a son named Olov and a daughter, of whom little is known. For his success in the war, Norby was rewarded with Börringe Priory in Scania and also owned Haraldsborg near Roskilde.
Under new King Christian II of Denmark, Norby was sent as leader of a fleet to aid Charles II of Burgundy against Geldern in 1514. and his blockade of Stockholm helped Christian II secure the Swedish throne in 1520.