United States
- William Campbell (business executive), former CEO of Intuit
- William Campbell (general) (1745–1781), Virginia militia general in the American Revolution
- William Campbell (NY surveyor) (c. 1767–1844), American physician, merchant, surveyor and politician from New York
- William W. Campbell (New York) (1806–1881), U.S. Representative from New York
- William B. Campbell (1807–1867), governor of Tennessee
- William Henry Campbell (1808–1890), president of Rutgers College
- William Wildman Campbell (1853–1927), U.S. Congressman from Ohio
- William Wallace Campbell (1862–1938), U.S. astronomer
- William March (1893–1954), born William E. Campbell, American soldier and novelist
- William Joseph Campbell (1905–1988), U.S. federal judge
- William C. Campbell (born 1923), former president of the United States Golf Association
- William Campbell (film actor) (1923–2011), American film and television actor
- Will D. Campbell (born 1924), American Baptist minister
- Bill Campbell (mayor) (born 1953), former mayor of Atlanta, Georgia
- Bill Campbell (illustrator), illustrator for the Hawk Model Company
- William Campbell (Medal of Honor, 1838) (1838–?), American Civil War sailor and Medal of Honor recipient
- William Campbell (Medal of Honor, 1840) (1840–1919), American Civil War soldier and Medal of Honor recipient
- Bill Campbell (sportscaster) (born 1923), sportscaster in the Philadelphia area
- Bill Campbell (California politician) (born 1942), Republican politician from California
- Bill Campbell (baseball) (born 1948), former Major League Baseball pitcher
- Billy Campbell (born 1959), American actor sometimes referred to as William O. Campbell or Bill Campbell
- Billy Campbell (TV executive) (born 1959), American TV executive producer
- Billy Campbell (baseball) (1873–1957), baseball player
- William Campbell (filmmaker), television and film producer, documentary filmmaker, and photojournalist
- William D. Campbell (1907–1995), world leader of the Boy Scouts
- William Hunter Campbell (1839–1862), Ohio civilian who worked for the Union Army during the American Civil War
- William M. Campbell, president of Discovery Networks U.S.
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Famous quotes related to united states:
“The United States Constitution has proved itself the most marvelously elastic compilation of rules of government ever written.”
—Franklin D. Roosevelt (1882–1945)
“I thought it altogether proper that I should take a brief furlough from official duties at Washington to mingle with you here to-day as a comrade, because every President of the United States must realize that the strength of the Government, its defence in war, the army that is to muster under its banner when our Nation is assailed, is to be found here in the masses of our people.”
—Benjamin Harrison (1833–1901)
“You are, I am sure, aware that genuine popular support in the United States is required to carry out any Government policy, foreign or domestic. The American people make up their own minds and no governmental action can change it.”
—Franklin D. Roosevelt (1882–1945)
“I am colored but I offer nothing in the way of extenuating circumstances except the fact that I am the only Negro in the United States whose grandfather on the mother’s side was not an Indian chief.”
—Zora Neale Hurston (1891–1960)
“The United States is not a nation to which peace is a necessity.”
—Grover Cleveland (1837–1908)