John McClelland Work (1869–1961) was an American socialist writer, lecturer, activist, and political functionary. Work is best remembered as a founding member of the Socialist Party of America and as the author of one of its best-selling propaganda tracts of the first decade of the 20th century. He was also the executive secretary of the Socialist Party of America from 1911 to 1913 and a frequent candidate for public office on its ticket.