People with the surname Arnold
- Benedict Arnold, American Revolution General officer who defected from the American to the British Side
- David Arnold, British composer
- Dominique Arnold, American hurdling athlete
- Eberhard Arnold, German Writer, Philosopher, and Theologian
- Georg Arnold-Graboné, German painter
- Henry H. Arnold, United States Air Force pioneer aviator and commanding general
- Jennette Arnold, Member of the Greater London Assembly
- Joanne Arnold, an American actress and model
- John D. Arnold, Hedge Fund Manager
- Karl Arnold, a German toy and model railway company founder
- Malcolm Arnold, British classical music composer
- Matthew Arnold, British poet and cultural critic
- Lucas Arnold, Argentine tennis player
- Tom Arnold (actor), American actor and comedian
- Vladimir Arnold, Russian mathematician
- Russel Arnold, Sri Lankan cricketer
- Douglas N. Arnold, director of Institute for Mathematics and its Applications
- Jamie Arnold, A Basketball Player
People with the given name Arnold
- Arnold Böcklin, symbolist Swiss painter
- Arnold Brown, the 11th General of The Salvation Army
- Arnold Fruchtenbaum, theologian and founder of Ariel Ministries
- Arnold Jackson (1891-1972), British athlete
- Arnold Palmer, American golfer
- Arnold Rüütel, Soviet politician, president of Estonia
- Arnold Schoenberg, composer
- Arnold Schwarzenegger, Austrian-born American bodybuilder, actor, and politician
- Saint Arnold, name of several saints
- Arnold Vosloo, South African actor
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