Kingsmill is a surname. Notable people with the name include:

15th century

• Sir John Kingsmill (judge) (1465–1509), Justice of the Common Pleas
• Sir John Kingsmill (high sheriff) (died 1556), High Sheriff of Hampshire

16th century

• William Kingsmill (priest) (died 1549), English clergyman, last Prior of Winchester, first Dean of Winchester, 1541–1549

17th century

• Anne Finch, Countess of Winchilsea (born Anne Kingsmill; 1661–1720), English poet

18th century

• Sir Robert Kingsmill, 1st Baronet (1730–1805), Royal Navy admiral

19th century

• Thomas Kingsmill Abbott (1829–1913), Irish scholar and educator and chair at Trinity College Dublin
• Walter Kingsmill (1864–1935), Australian politician
• Hugh Kingsmill (1889–1949), British writer and journalist
• Charles Kingsmill (1855–1935), Canadian admiral

20th century

• William Kingsmill (politician) (1905–1971), British soldier, businessman, Conservative Member of Parliament for Yeovil from 1945 to 1951
• John Kingsmill (1920–2013), Australian author and actor
• Richard Kingsmill (born 1964), Australian music journalist
• Mark Kingsmill (born 1956), Australian musician, member of the Hoodoo Gurus band