William Borthwick may refer to:

• William Borthwick (Canadian politician) (1848–1928), mayor of Ottawa, 1895–1896
• Bill Borthwick (1924–2001), Australian politician
• William Borthwick, 1st Lord Borthwick (died 1458), Scottish peer and ambassador
• William Borthwick, 2nd Lord Borthwick (died 1483), Scottish ambassador to England
• William Borthwick, 3rd Lord Borthwick (died 1503), Scottish nobleman and ambassador
• William Borthwick, 4th Lord Borthwick (died 1542), Scottish nobleman
• William Borthwick (Dorset politician) (1879–1956), British Army Captain and barrister
• William Jason Maxwell Borthwick (1910–1998), British barrister and Royal Naval Volunteer Reserve officer
• William Borthwick (surgeon) (1641–1689), Scottish surgeon

• Borthwick (surname)

Topics referred to by the same term

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