Ansgar Eugène Olaussen (27 December 1887 – 22 January 1962) was a Norwegian newspaper editor, educated as a typographer, and politician.
As a politician he started in Young Communist League of Norway (Norges Socialdemokratiske Ungdomsforbund, and notably edited Klassekampen from 1911 to 1921.
For the Labour Party he was county leader, central board member and MP for slightly more than a year, until he joined the Communist Party in 1923.
Some years after finishing his sole term as an MP for the Communists, he shifted to the far right and associated himself with Nazism during the Second World War.