Østen Gottlieb Reimar Riefling (4 December 1898 - 22 May 1981) was a Norwegian classical pianist, pedagogist and music critic, a brother of pianist Robert Riefling. He made his concert debut in Dresden in 1922, and toured in Germany and Scandinavia. He was a piano lecturer at the German: Städtisches Konservatorium in Hannover from 1925, later in Oslo where he chaired Norwegian: Rieflings Klaverinstitutt along with his brother Robert from 1941 to 1952, and from 1963 to 1973 at the Ingesund College of Music in Sweden.[1] [2]