McClure's or McClure's Magazine (1893–1929) was an American illustrated monthly periodical popular at the turn of the 20th century. The magazine is credited with having started the tradition of muckraking journalism (investigative, watchdog or reform journalism), and helped shape the moral compass of the day. 
Founded by S. S. McClure (1857–1949) and John Sanborn Phillips (1861–1949), who had been classmates at Knox College in June 1893, the magazine featured both political and literary content, publishing serialized novels-in-progress, a chapter at a time. In this way, McClure's published such writers as Willa Cather, Arthur Conan Doyle, Herminie T. Kavanagh, Rudyard Kipling, Jack London, Lincoln Steffens, Robert Louis Stevenson, and Mark Twain.
Examples of its work include Ida Tarbell's series in 1902 exposing the monopoly abuses of John D. Rockefeller's Standard Oil Company, and Ray Stannard Baker's earlier look at the United States Steel Corporation, which focused the public eye on the conduct of corporations. From January 1907 to June 1908, McClure's published the first detailed history of Christian Science and the story of its founder, Mary Baker Eddy (1821–1910) in 14 installments. The articles were later published in book form as The Life of Mary Baker G. Eddy and the History of Christian Science (1909).
In 1906, the writing staff defected over disputes with McClure and formed The American Magazine. McClure's began to lose readers and went into debt. S. S. McClure was forced to sell the magazine to creditors in 1911. It was re-styled as a women's magazine and ran inconsistently in this format, with publication from October 1921 to February 1922, September 1924 and April 1925, and February to May 1926. The later issues, from July 1928 until March 1929, were published under the name New McClure's Magazine. The last issue was in March 1929, after which the magazine was taken over by The Smart Set.
- J.M. Barrie
- Stephen Crane
- Arthur Conan Doyle
- Herminie T. Kavanagh
- Rudyard Kipling
- Bruno Lessing
- Jack London
- Frank Norris
- Marjorie Pickthall During the 1900s and 1910s the Anglo-Canadian poet, story writer and essayist was a regular contributor.
- Robert Louis Stevenson
- Mark Twain
- Tassin, Algernon (December 1915). "The Magazine In America, Part X: The End Of The Century". The Bookman XLII (4): 398–404.
- Irving Fang, A history of mass communication, Focal Press, 1997, p.56.
- Greg Gross (1997), The Staff Breakup of McClure's Magazine, chapter 2.
- Hakim, Joy (1994). A History of US: An Age of Extremes, 1880–1917. Oxford University Press. pp. 126–127.
- McClure's, December 1906; Milmine, January 1907 – June 1908, 14 articles.
- Stouck, David. "Introduction," in Willa Cather and Georgine Milmine. The Life of Mary Baker G. Eddy and the History of Christian Science. University of Nebraska Press, 1993.
- To read the 1909 edition, see here.
- Union List of Serials ... 3rd Edition. New York, H. W. Wilson, 1965. p.3003.
- Barbara Godard. "Marjorie Pickthall". Dictionary of Canadian Biography Online. Retrieved November 1, 2010.
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- McClure's Magazine at Project Gutenberg, filed under Various (plain text and HTML)
- McClure's Magazine at Internet Archive, misc. volumes (scanned books original editions color illustrated)
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- McClure's Magazine at Google Books, misc. volumes (scanned books original editions)
- McClure’s Magazine editions up to 1913
- McClure's Magazine at The Modernist Journals Project: cover-to-cover, searchable issues that include original wrappers, contents pages, and advertising