Antti Amatus Aarne (5 December 1867 – 2 February 1925) was a Finnish folklorist.

He further developed their historic-geographic method of comparative folkloristics, and the initial version of what became the Aarne–Thompson classification system of classifying folktales, first published in 1910 and extended by Stith Thompson first in 1927 and again in 1961.

Early in February 1925, Aarne died in Helsinki where he had been a lecturer at the University since 1911 and where he had held a position as Professor extraordinarius since 1922.

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