Carnwath is a surname. Notable people include:
Alison Carnwath (born 1953), British businesswoman Sir Andrew Carnwath (1909–1995), British banker Francis Carnwath (1940–2020), director of the Greenwich Foundation for the Royal Naval College Robert Carnwath, Lord Carnwath of Notting Hill (born 1945), British Supreme Court judge Squeak Carnwath (born 1947), American painter and arts educator