William McKinley (1843–1901) was the 25th president of the United States from 1897 to 1901.
William McKinley may also refer to:
William McKinley (Virginia politician) (fl. 19th century), U.S. representative from Virginia (1810–1811) William B. McKinley (1856–1926), U.S. representative and senator from Illinois William Laird McKinlay (1889–1983), author of his own survivor's account of the Last voyage of the Karluk William Michael McKinley (1879–1964), speaker of the Illinois House of Representatives William Thomas McKinley (1938–2015), American composer and jazz pianist William McKinley Sr. (1807–1892), American manufacturer, father of President William McKinley Bill McKinley (1910–1980), American baseball umpire in the American League, 1946–1965 Bill McKinley (footballer) (1882–1952), American rules footballer
SS William McKinley, a Liberty ship
See also Billy McKinlay (born 1969), Scottish footballer and manager William McKinlay (fl. 1860s–1870s), South Carolina tailor and state legislator Jazz Gillum (William McKinley Gillum, 1904–1966), harmonica player