Lascelles (pronounced Lassels) is a surname. Notable people with the surname include:
- Alan Lascelles (1887–1981) "Tommy" Lascelles was Private Secretary to both King George VI and Queen Elizabeth II
- Daniel Lascelles (1655-1734), English landowner and politician of Stank and Northallerton, North Riding, Yorkshire
- Daniel Lascelles (1714-1784), English landowner, merchant and British politician of Goldsborough Hall
- Daniel Lascelles (1902-1967), British ambassador to Japan
- David Lascelles, Viscount Lascelles (born 1950)
- Edward Lascelles, 1st Earl of Harewood (1740-1820), British peer and politician
- Edwin Lascelles, 1st Baron Harewood (1713-1795), British landowner and politician, built Harewood House
- Edwin Lascelles (1799-1865), barrister and MP for Ripon from 1846 to 1857
- Eric Lascelles (born 1977) Economist, Banker, former middle-distance runner
- Francis Lascelles (1612-1667), Member of English Parliament and New Model Army officer of Stank Hall
- Francis William Lascelles (1890–1979), Clerk of the Parliaments 1953-1959
- Frank Lascelles (1841-1920), British diplomat, ambassador to Germany and to Russia
- Gerald Lascelles (1924–1998) son of the 6th Earl of Harewood and Princess Mary
- Henry Lascelles (1690–1753), English merchant, landowner and politician of Harewood, Yorkshire
- Henry Lascelles, 2nd Earl of Harewood (1767-1841), British peer and politician
- Henry Lascelles, 3rd Earl of Harewood (1797-1857), British peer and politician
- Henry Lascelles, 4th Earl of Harewood (1824 – 1892), British peer
- Henry Lascelles, 5th Earl of Harewood (1846 – 1929), British peer
- Henry Lascelles, 6th Earl of Harewood (1882 – 1947), British peer
- James Lascelles (born 1953) British musician and son of the 7th Earl of Harewood
- Margaret Lascelles, Viscountess Lascelles (born 1948), the former wife of David Lascelles, Viscount Lascelles
- Thomas Lascelles (1624-1697), Member of English Parliament and New Model Army officer
- William Lascelles (1798-1851), British politician and son of Henry Lascelles, 2nd Earl of Harewood