Lanctôt is a surname. Notable people with the surname include:
Adélard Lanctôt (1874–1919), Canadian lawyer and politician Gustave Lanctot (1883–1975), Canadian historian and archivist Guylaine Lanctôt (1941–2025), Canadian phlebologist Hermine Lanctôt (1861-1943), Canadian author, journalist, and schoolteacher Jacques Lanctôt (born 1945), Canadian writer and convicted kidnapper Louise Lanctôt (born 1947), Canadian writer and convicted kidnapper Micheline Lanctôt (born 1947), Canadian actress, film director, screenwriter and musician Robert Lanctôt (born 1963), Canadian politician Roch Lanctôt (1866–1929), Canadian politician
See also Lanquetot, French commune in département Seine-Maritime, Region Normandy Langtoft, England.