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Arnold is a German and English surname. Notable people with the surname include:
- A. Otis Arnold (1878–1941), American businessman and politician
- Alice Arnold (disambiguation), several people
- Ann Arnold (1936–2015), English artist
- Augusta Foote Arnold (1844–1904) American naturalist and author
- Bené Arnold, American dance scholar
- Benedict Arnold (disambiguation), several people
- Benedict Arnold (1741–1801), American Revolution general, defected to Britain
- Benedict Arnold (congressman) (1780–1849), American politician from New York
- Benedict Arnold (governor) (1615–1678), governor of the Rhode Island colony
- Bogdan Arnold (1933–1968), Polish serial killer
- Brad Arnold (born 1978), 3 Doors Down singer
- Carl Arnold (composer), American football coach
- Carl Arnold (composer) (1794–1873), German composer
- Catherine Arnold (born 1978), British diplomat
- Cecile Arnold (1891 or 1895–1931), American silent film actress
- Cedric Arnold (1907–1980), English organ-builder
- Charles Arnold-Baker, English member of MI6, barrister, and historian
- Clinton E. Arnold (born 1958), American New Testament scholar
- Cornelius Arnold (1711–after 1757), American poetical writer
- David Arnold (disambiguation), several people
- Delia Arnold (born 1986), Malaysian squash player
- Dominique Arnold (born 1973), American hurdling athlete
- Dorothy Arnold (actress) (1917–1984), American film actress
- Douglas N. Arnold, American mathematician
- Đuro Arnold (1853–1941), Croatian writer and philosopher
- Dutee Arnold (1763–1849), Justice of the Rhode Island Supreme Court
- Dylan Arnold (born 1994), American actor
- Earl C. Arnold (1884–1949) American academic administrator
- Eberhard Arnold (1883–1935), German writer, philosopher, and theologian
- Eddy Arnold (1918–2008), American country music singer
- Eduardo Arnold (born 1947), Argentine politician
- Edward Arnold (disambiguation), several people
- Edward Vernon Arnold (1857–1926), British scholar of Sanscrit and Latin
- Sir Edwin Arnold (1832–1904), English poet and journalist
- Edwin Lester Arnold (1857–1935), English author
- Edwin Nicholas Arnold (born 1940), British herpetologist
- Elana Arnold, children's and young adult author
- Elliott Arnold (1912–1980), American novelist and screenwriter
- Ethel Arnold (1864 or 5 –1930), English journalist, author, and lecturer on female suffrage
- Florence Arnold, English singer, songwriter and drummer, known as Florrie
- Frances Arnold (born 1956), American chemical engineer and Nobel laureate
- Franck Thomas Arnold (1861–1940), Anglo-German musicologist and bibliophile
- Frank Arnold (disambiguation), several people
- Franz Arnold (1878–1960), Germany comedy writer
- Frieda Arnold (fl. 1854–1859), British courtier, dresser (lady's maid) to Queen Victoria of Great Britain.
- Friedrich Arnold (1803–1890), German anatomist
- Friedrich Wilhelm Arnold (1810–1864), German musician, music seller, publisher and folk-song collector
- Geoff Arnold (born 1944), English cricketer
- Georg Arnold-Graboné (1896–1982), German painter and art teacher
- George William Arnold, American telecoms protocol engineer
- Gillian Arnold, British artist
- Godfrey Edward Arnold (1914–1989), Austrian American professor of medicine
- Graham Arnold (born 1963), Australian football player and manager
- Grayland Arnold (born 1997), American football player
- Harriet Pritchard Arnold (1858–1901), American author
- Helen Arnold, silent film actress
- Henry H. Arnold (1886–1950), American aviation pioneer and commanding general
- Hollie Arnold (born 1994), British parasport athlete
- Horace Lucian Arnold (1837–1915), American writer on management
- Ian Arnold (born 1972), English football player
- Isaac N. Arnold (1815–1884), congressman during American Civil War; biographer of Abraham Lincoln
- James Arnold (disambiguation), several people
- Jamie Arnold (disambiguation), several people
- Jay Arnold (American football) (1912–1982), American football player
- Jennette Arnold, Montserrat-born British politician
- Jim Arnold (disambiguation), several people
- Joanne Arnold (born 1931), American actress and model
- Joe Arnold (born 1947), American baseball coach
- John Arnold (disambiguation), several people
- Johann Georg Daniel Arnold (1780–1829), German writer
- Johann Gottfried Arnold (1773–1806), German cellist
- Jonathan Arnold (1741–1793), American physician and statesman
- Josiah D. Arnold (1820–1903), American businessman and politician
- Karl Arnold (disambiguation), several people
- Ken Arnold (born 1958), American computer programmer and developer of Rogue
- Kenneth Arnold (1915–1984), American aviator, noted for his UFO sighting
- Lenna Arnold (1920–2010), American baseball player
- Lucas Arnold Ker (born 1974), Argentine tennis player
- Luke Arnold (born 1984), Australian actor
- Mackenzie Arnold (born 1994), Australian footballer
- Malcolm Arnold (1921–2006), English composer and symphonist
- Marc Arnold (born 1970), South African football player
- Margery Arnold (fl. mid 14th century), landowner
- Martin Arnold (disambiguation), several people
- Matthew Arnold (1822–1888), English poet and cultural critic
- Monica (entertainer) (Monica Denise Arnold) (born 1980), American singer
- Nathan Arnold (born 1987), English football player
- Nicholas Arnold (disambiguation), several people
- Nick Arnold (footballer) (born 1993), English football player
- Nick Arnold (writer), British writer
- Norbert P. Arnold (1920–2014), American politician and inventor
- P. P. Arnold, American soul singer
- Patricio Arnold (born 1971), Argentine tennis player
- Rainer Arnold (born 1950), German politician
- Ralph Arnold (1906–1970), British author and publisher
- Ralph Arnold (1928–2006), American artist and educator
- Richard Arnold (disambiguation), several people
- Robert Arnold (disambiguation), several people
- Russ Arnold, American bridge player
- Russel Arnold (born 1973), Sri Lankan cricketer
- Samuel Arnold (disambiguation), several people
- Stanley Arnold (1903–1984), American politician
- Stanley P. V. Arnold (1856–1901), American politician and newspaper editor
- Tom Arnold (disambiguation), several people
- Thomas Arnold (disambiguation), several people
- Trent Alexander-Arnold (born 1998), English football player
- Victor Arnold (disambiguation), several people
- Villiers Arnold (1876–1921) actor and singer in Gilbert and Sullivan operas
- Vladimir Arnold (1937–2010), Russian mathematician
- Wayne Arnold (born 1984), American basketball player
- Werner Arnold (weightlifter) (born 1931), German weightlifter
- William Arnold (disambiguation), several people