Cranstoun may refer to:
People Clan Cranstoun, Lowland Scottish clan Lord Cranstoun, title in the Peerage of Scotland William Cranstoun, 1st Lord Cranstoun (died 1627), Scottish Lord of Parliament John Cranstoun, 2nd Lord Cranstoun (died c. 1648), Scottish Lord of Parliament William Cranstoun, 3rd Lord Cranstoun (c. 1620 – 1664), Scottish Lord of Parliament James Cranstoun, 8th Lord Cranstoun (1755–96), officer of the Royal Navy George Cranstoun, Lord Corehouse (died 1850), Scottish advocate, judge and satirist Louisa Cranstoun Nisbett (1812–58), English actress Reuben Cranstoun Mowbray (1883–1955), newspaper editor and member of the South Australian parliament Si Cranstoun (born c. 1976), British singer
Other
HMS Cranstoun (K511), Captain-class frigate of the British Royal Navy that served in the last two years of World War II.