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