Carter Henry Harrison IV (April 23, 1860 – December 25, 1953) was an American newspaper publisher and Democratic politician who served a total of five terms as mayor of Chicago (1897–1905 and 1911–1915) but failed in his attempt to become his party's presidential nominee in 1904.

The name of one Chicago saloon-keeper of the time supposedly entered the English language as a term for a strong or laced drink intended to render unconsciousness: Mickey Finn.

One of Harrison's biggest enemies was Charles Yerkes, whose plans to monopolize Chicago's streetcar lines were vigorously attacked by the mayor.

During his final term in office, Harrison established the Chicago Vice Commission and worked to close down the Levee district, starting with the Everleigh Club brothel on October 24, 1911.

Harrison declined to seek a fifth consecutive mayoral term in 1905, and was succeeded by fellow Democrat Edward Fitzsimmons Dunne on April 10, 1905.

[11] Harrison sought a sixth overall term as mayor in 1915, but was defeated in the Democratic primary by Robert Sweitzer, who went on to lose the general election to Republican William Hale Thompson.

From 1933 through 1944, Harrison served as the Internal Revenue Service collector for district of Chicago, having been appointed to the position by president Franklin D. Roosevelt on July 28, 1933.

[16][17] His wife, Edith Ogden Harrison, was a well-known writer of children's books and fairy tales in the first two decades of the 20th century.