Oskar Kallas, Estonian linguist and diplomat (d. 1946)

Oskar Kallas (also Oskar Philipp Kallas; 25 October [O.S. 13 October] 1868 in Kirikuküla, Saaremaa – 26 January 1946 in Stockholm) was an Estonian diplomat, linguist and folklorist. He was the husband of the Finnish writer Aino Kallas.