Oscar Ameringer (August 4, 1870 – November 5, 1943) was a German-American Socialist editor, author, and organiser from the late 1890s until his death in 1943. Ameringer made a name for himself in the Socialist Party of Oklahoma as the editor of its newspaper and a prominent organiser for the party. His most famous work, The Life and Deeds of Uncle Sam, was a widely read satire of American history that sold over half a million copies and was translated into 15 languages. His wit as a speaker and writer and his reputation as being one of the grand old men of left-wing politics in the United States led to him being described as the "Mark Twain of American Socialism".