United Kingdom
- Billy Campbell (footballer) (born 1920), Scottish footballer (Greenock Morton FC)
- William Campbell (missionary) (1841–1921), Presbyterian missionary to Taiwan
- Willie Campbell (c. 1900–?), Scottish footballer
- William Campbell (footballer) (1865–?), Scottish forward with various clubs including Preston North End, Darwen and Newton Heath
- William Campbell (Everton footballer) (1865?–?), Scottish centre half in Everton F.C.'s 1890–91 English League Championship winning team
- Junior Campbell (William Campbell, born 1947), musician & composer
- William Campbell (metallographer) (1876–1936), English metallurgist
- William Campbell (Scottish musician), Scottish musician
- William Charles Campbell (1889–1958), World War I fighter pilot
- William Robert Campbell, first British colonial Inspector General of Police of Ceylon (Sri Lanka)
- William Pitcairn Campbell (1856–1933), British Army general during World War I
- William Campbell, 2nd Baron Stratheden and Campbell (1824–1893), British peer and Liberal politician
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Famous quotes containing the words united and/or kingdom:
“The United States have a coffle of four millions of slaves. They are determined to keep them in this condition; and Massachusetts is one of the confederated overseers to prevent their escape.”
—Henry David Thoreau (1817–1862)
“Truly I tell you, unless you change and become like children, you will never enter the kingdom of heaven.”
—Bible: New Testament, Matthew 18:3.