The Chicago Tribune is a daily newspaper based in Chicago, Illinois, United States, owned by tronc, Inc., formerly Tribune Publishing. Founded in 1847, and formerly self-styled as the "World's Greatest Newspaper" (for which WGN radio and television are named), it remains the most-read daily newspaper of the Chicago metropolitan area and the Great Lakes region and is currently the eighth largest newspaper in the United States by circulation (and became the second largest under Tribune's ownership after the Chicago Tribune's parent company purchased the Los Angeles Times).

Traditionally published as a broadsheet, on January 13, 2009, the Tribune announced it would continue publishing as a broadsheet for home delivery, but would publish in tabloid format for newsstand, news box and commuter station sales. The move, however, proved to be unpopular with readers and in August 2011, the Tribune discontinued the tabloid edition, returning to its traditional broadsheet edition through all distribution channels.

The Tribune's masthead is notable for displaying the American flag, in reference to the paper's motto, "An American Paper for Americans," which is no longer displayed on the masthead, where it was below the flag.

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