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, and helped direct the moral compass of the day.

The muckrakers were reform-minded journalists, writers, and photographers in the Progressive Era in the United States (1890s–1920s) who claimed to expose corruption and wrongdoing in established institutions, often through sensationalist publications. The modern term generally references investigative journalism or watchdog journalism; investigative journalists in the US are occasionally called "muckrakers" informally.