Clarence A. "Charlie" Hathaway (8 Jan 1892 – 23 January 1963) was an activist in the Minnesota trade union movement and a prominent leader of the Communist Party of the United States from the 1920s through the early 1940s. He is best remembered as the party's leading organizer of the Federated Farmer-Labor Party in 1923 and 1924, as the editor of The Daily Worker (1933–1940), and as a longtime member of the Communist Party's governing Central Committee. He was also a longtime informant for the FBI.