Arbeideren was a Norwegian newspaper, published in Hamar, Hedmark county. It was started in 1909 as the press organ of the Labour Party in Hedemarken and its adjoining regions, and was called Demokraten until 1923. It was issued three days a week between 1909 and 1913, six days a week in 1914, three days a week again between 1914 and 1918 before again increasing to six days a week. It was renamed to Arbeideren in 1923, and in the same year it was taken over by the Norwegian Communist Party. The Communist Party incorporated the newspaper Gudbrandsdalens Arbeiderblad into Arbeideren in 1924, and until 1929 the newspaper was published under the name Arbeideren og Gudbrandsdalens Arbeiderblad. After Arbeideren had gone defunct, the name was used by the Communist Party for other newspapers elsewhere.

The Communist Party of Norway is a communist party in Norway.