Dag Alvar Strömbäck (13 August 1900 – 1 December 1978) was a Swedish folklorist, historian of religion and philologist.

Strömbäck was born in Järbo but grew up from the age of three in Alfta, where his father was appointed pastor.

In 1937–38, he was a visiting professor at the University of Chicago and was offered a permanent position, but he returned to Sweden in 1939 after one further year.

In 1941, he became a docent in Nordic languages at Uppsala University; in July 1947 he was appointed Professor of Norse and Comparative Folklore.

He married Rosalie Olivecrona on 24 September 1927;[1] they had one daughter, Gertrud Gidlund [sv], a journalist and editor.