Ny Dag ('New Day') was a Swedish communist newspaper and the main publication of the Communist Party of Sweden (later renamed 'Left Party – Communists') from 2 January 1930 to 5 August 1990, when publication stopped. Ny Dag was started in 1930 by the branch of the Communist Party that had selected to remain faithful to Comintern in the big party split of 1929, in order to replace Folkets Dagblad Politiken, which had been the party's main publication since 1917, but had selected to join the "Kilbom rebels" in the 1929 split.