William Arnott

William Arnott may refer to:


 * William Arnott (biscuit manufacturer) (1827–1901), Australian manufacturer and businessman
 * William Arnott (politician) (1832–1907), American farmer and politician
 * Bob Arnott or William Robert Arnott (1922–2016), Australian skier
 * W. Geoffrey Arnott (1930–2010), British Hellenist
 * Sir William Melville Arnott (1909–1999), Scottish academic