William Coates

William Coates may refer to:


 * Sir William Coates, 1st Baronet (1866–1932), Irish stockbroker, Lord Mayor of Belfast, 1920–1923, 1929–1931
 * William Coates (businessman) (1882–1963), British civil servant and businessman
 * William Coates (longevity claimant) (1911–2004), American alleged centenarian
 * William Peyton Coates (1883–1963), Irish labour activist and communist
 * William Coates (technician) (1919–1993), science communicator, lecturer and technician
 * William Paul Coates (born 1946), African-American publisher and father of Ta-Nehisi Coates