Nina Ivanovna Gagen-Torn [a] (Russian: Ни́на Ива́новна Га́ген-То́рн, IPA: [ˈnʲinə ɪˈvanəvnə ˈɡaɡʲɪn ˈtorn] ⓘ; December 15 [O.S.

December 2] 1900 — June 4, 1986) was a Russian and Soviet poet, writer, historian and ethnographer.

Most of her research was in the area of ethnography of the peoples of the Soviet Union, Russian and Bulgarian folklore, and the history of the Russian ethnography She was born in St. Petersburg to a noble (dvoryan) family of baron Ivan Eduardovich Gagen-Torn, physician, Russified Swede.

In 1946, she earned the degree of kandidat in ethnography with thesis "Elements of Dress of Volga Peoples as a Material for Ethnogenesis".

From 1964, she devoted herself to the study of The Tale of Igor's Campaign and put forth a number of original hypotheses.