William Manchester was a historian.

William Manchester may also refer to:

• William Manchester (MP) for Carlisle (UK Parliament constituency)
• William Montagu, 7th Duke of Manchester
• William Montagu, 2nd Duke of Manchester
• William Montagu, 5th Duke of Manchester
• William Montagu, 9th Duke of Manchester

• British pharmacological society
• British Pharmacological Society
• British Pharmacopoeia Commission
• British phone numbers
• British Phonographic Industry
• British Phonographic Industry Limited
• British Phosphate Commission
• British Phosphate Commissioners
• British Pipeline Agency
• British Plan of Campaign in the West
• British poetry since 1945
• British Poetry since 1945 (Penguin)
• British police
• British police strikes in 1918 and 1919
• British-Polish Alliance
• British Polish Chamber of Commerce
• British-Polish Military Alliance
• British Political Officer
• British political parties
• British political party
• British political scandals
• British politician
• British Polling Council
• British pop charts
• British possessions