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
See also Duncanson-Cranch House, listed on the National Register of Historic Places in Washington, D.C.