Uno Nils Oskar Harva (known as Uno Holmberg until 1927; 30 August 1882, Ypäjä – 13 August 1949, Turku) was a Finnish religious scholar, who founded the discipline in Finland together with Rafael Karsten.

[2] Harva conducted fieldwork among the Siberian Ket and Evenk peoples in the 1910s, researching their mythology and religion.

He also spent the summers of 1911–1913 with the Finno-Ugric Votyaks (Udmurts) in the Urals and the Cheremis (the Mari people) on the Volga.

[3][4] His study Der Baum des Lebens (The Tree of Life; 1922–23) was the first to show that the world tree from Norse mythology had many parallels in Europe and Asia.

[5] Harva wrote the fourth volume of the book series The Mythology of All Races in 1927.