Cranch is a surname. Notable people with the surname include:
Christopher Pearse Cranch (1813–1892), American writer and artist
John Cranch (naturalist) (1758–1816), English naturalist and explorer
John Cranch (American painter) (1807-1891), American painter
John Cranch (English painter) (1751–1821), English painter
William Cranch (1769–1855), American judge