Whitehorn or Whitehorne is a surname. Notable people with the name include:
Geoff Whitehorn (born 1951), British singer-songwriter George Whitehorne (died 1565), Canon of Windsor Jason Whitehorn (born 1976), American singer-songwriter John Clare Whitehorn (1894–1974), American psychiatric educator Joseph A. Whitehorn (1879–1926), American politician Katharine Whitehorn (1928–2021), British journalist Laura Whitehorn (born 1945), American activist Will Whitehorn (born 1960), British business executive