Olaf Helliesen Lange (11 February 1875 – 19 April 1965) was a Norwegian painter and print maker who also lived in France and Germany.
Lange's fin-de-siècle art has its own special approach visualizing the complexity of the modern urban life.Olaf Lange is best known for his symbolistic paintings and the multicolored aquatint etchings he made between 1903 and 1912, which are closely linked to the continental art nouveau style.
The unique qualities of Lange's fin de siècle art are appreciated internationally.
Among other prizes, Lange received a gold medal for graphics at the XI International Exhibition in Munich in 1913 and a Medal of Honor at the Panama–Pacific International Exposition in San Francisco in 1915.