Frans Gunnar Bengtsson (4 October 1894 – 19 December 1954) was a Swedish novelist, essayist, poet, and biographer. He was born in Tåssjö (now in Ängelholm Municipality) in Scania and died at Ribbingsfors Manor in northern Västergötland.

Bengtsson was born and raised in the southern Swedish province of Skåne, the son of an estate manager. His early writings, including a doctoral thesis on Geoffrey Chaucer and two volumes of poetry written in what were considered antiquated verse forms, revealed a career-long interest in historical literary modes and themes. Bengtsson was a prolific translator (of Paradise Lost, The Song of Roland, and Walden), essayist (he published five collections of his writings, mostly on literary and military topics), and biographer (his two-volume biography of Charles XII (Karl XII:s levnad) won the Swedish Academy’s annual prize in 1938). In 1941, he published Röde Orm: Sjöfarare i västerled (Red Orm at Home and on the Western Way).