William Arnold may refer to:
- William Arnold (settler) (1587–1676), one of founding settlers in Rhode Island
- William Arnold (architect) (fl. 1595–1637), master mason in Somerset, England
- William W. Arnold (1877–1957), U.S. Representative from Illinois
- William Carlile Arnold (1851–1906), Republican member of the U.S. House of Representatives from Pennsylvania
- William Richard Arnold (rugby player) (1881–1957), Welsh rugby international
- William Richard Arnold (bishop) (1881–1965), U.S. Army Chief of Chaplains
- William Arnold (footballer) (1900–1977), English footballer
- William Munnings Arnold (1819–1875), Australian member of the New South Wales Legislative Assembly
- William Delafield Arnold (1828–1859), British author and colonial administrator
- William Howard Arnold (1901–1976), Lieutenant General in the United States Army
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Famous quotes containing the word arnold:
“And we are here as on a darkling plain
Swept with confused alarms of struggle and flight,
Where ignorant armies clash by night.”
—Matthew Arnold (1822–1888)