Under röd flagg
 Under röd flagg (Swedish for 'Under red flag') was a weekly magazine published in Sweden in 1891 by Hinke Bergegren. Bergegren acted as the editor and publisher of the magazine. Nine issues were published from March to June 1891. Under röd flagg sought to bring together writers from the political peripheries of the Social-Democratic Party. Articles in the publication contained Marxist anarchist and anarchist communist ideas.