Arnold is a German and English surname.
A branch of one Arnold family came from England in the person of William Arnold then Guilherme Arnaut, illustrious Knight, Overseer and Mayor-Major of Queen Philippa of Lancaster, whom he accompanied to Portugal, governing her also her house. He married, in England, Moyanda, of whom he left issue which continued the surname. In Portugal, was written the surname Arnao and, sonically, Ernao. In the present not only its rare bearers use the form Arnaud, but they also pronounce it the French way, for ignorance, for certain, of the origin. The Arnauts use the following arms: argent, six lions sable, set 2, 2 and 2; crest: a lion of the shield.
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
Anthony Arnold (1896–1954), British flying ace
Augusta Foote Arnold (1844–1904) American naturalist and author
Ben Arnold (disambiguation), several people
Bené Arnold (1935–2024), 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
Benjamin Arnold (disambiguation), several people
Bill Arnold (disambiguation), several people
Billy Arnold (disambiguation), several people
Bogdan Arnold (1933–1968), Polish serial killer
Brad Arnold (1978–2026), American musician, 3 Doors Down singer
Carl Arnold (American football), American football coach
Carl Arnold (composer) (1794–1873), German composer
Catherine Arnold (born 1978), British diplomat
Cecile Arnold (1893–1931), American silent film actress
Cedric Arnold (1907–1980), English organ-builder
Charles Arnold-Baker (1918–2009), English member of MI6, barrister, and historian
Clinton E. Arnold (born 1958), American New Testament scholar
Cornelius Arnold (1711–1757?), 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 (1940–2023), British herpetologist
Elana K. Arnold, children's and young adult author
Elliott Arnold (1912–1980), American novelist and screenwriter
Ethel Arnold (1865 –1930), English journalist, author, and lecturer on female suffrage
Florence Arnold (born 1988), English singer, songwriter and drummer, known as Florrie
Frances Arnold (born 1956), American chemical engineer and Nobel laureate
F. T. 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 (born 1971), British artist
Godfrey Edward Arnold (1914–1989), Austrian American professor of medicine
Gordon Arnold (1941–1997), alleged witness to John F. Kennedy's assassination
Gottfried Arnold (politician) (1933–2015), German politician
Graham Arnold (born 1963), Australian football player and manager
Grayland Arnold (born 1997), American football player
Harriet Pritchard Arnold (1858–1901), American author
Heinz Arnold (1919–1945), German World War II fighter pilot
Helen Arnold (1890–1976), 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 and biographer of Abraham Lincoln
Iwan Arnold (born 1991), Swiss ski mountaineer
Jack Arnold (disambiguation), several people
James Arnold (disambiguation), several people
Jamie Arnold (disambiguation), several people
Jay Arnold (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
Jonathan Earle Arnold (1814–1869), Wisconsin politician
Josiah D. Arnold (1820–1903), American businessman and politician
Julian Arnold (born 1991), American professional pickleball players
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
KK Arnold (born 2005), American basketball player
Lenna Arnold (1920–2010), American baseball player
Leslie Arnold (1942–2010), American murderer and long-term fugitive
Lucas Arnold Ker (born 1974), Argentine tennis player
Luke Arnold (born 1984), Australian actor
Mackenzie Arnold (born 1994), Australian footballer
Sir 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
Maximilian Arnold (born 1994), German footballer
Monica Denise Arnold (born 1980), American singer, known as Monica
Nathan Arnold (born 1987), English football player
Nicholas Arnold (disambiguation), several people
Nick Arnold (footballer) (born 1993), English football player
Nick Arnold (writer) (born 1961), British writer
Nicky Arnstein (1879–1965), alias Nick and Nicholas Arnold
Norbert P. Arnold (1920–2014), American politician and inventor
P. P. Arnold (born 1946), 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
Rich Arnold (born 1945), Iowa state representative
Richard Arnold (disambiguation), several people
Richie Arnold (born 1990), Australian rugby union player
Robert Arnold (disambiguation), several people
Ronald Arnold (1908–1963), British engineer
Russ Arnold (1921–2012), American bridge player
Russel Arnold (born 1973), Sri Lankan cricketer
Samuel Arnold (disambiguation), several people
Sheldon Arnold (born 2002), American football player
Stanley Arnold (1903–1984), American politician
Stanley P. V. Arnold (1856–1901), American politician and newspaper editor
Tabitha Arnold (born 1995), American artist
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) (1931–2025), German weightlifter
William Arnold (disambiguation), several people