William Arbuthnot or Arbuthnott may refer to:
Sir William Arbuthnot, 1st Baronet (1766–1829), Lord Provost of Edinburgh Sir William Arbuthnot, 3rd Baronet (1831–1889), major in the 18th Hussars William Arbuthnot (British Army officer) (1838–1893), Major General in the 14th Hussars Sir William Arbuthnot Lane, 1st Baronet (1856–1943), surgeon Sir William Arbuthnot Lane, 2nd Baronet (1897–1972), actor and producer Sir William Arbuthnot, 2nd Baronet (1950–2021) William Reierson Arbuthnot (1826–1913), British businessman and legislator William Urquhart Arbuthnot (1807–1874), British administrator in India