William Coates
William Coates may refer to:
- Sir William Coates, 1st Baronet, Irish stockbroker, Lord Mayor of Belfast, 1920–1923, 1929–1931
- William Coates (businessman), British civil servant and businessman
- William Coates (longevity claimant), American alleged centenarian
- William Peyton Coates, Irish labour activist and communist
- William Coates (technician), science communicator, lecturer and technician
- William Paul Coates, African-American publisher and father of Ta-Nehisi Coates