Søren Norby, selfstyled as Severin Norbi (died 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.