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 Richard Kingsmill (MP) (c. 1528-1600), English politician 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