William Marsden
William Marsden may refer to:
- William Marsden (diplomat), former British Ambassador to Argentina and Costa Rica
- William Marsden (orientalist), the British First Secretaries to the Admiralty. Also an orientalist, linguist and numismatist
- William Marsden (sport shooter), British Olympic sport shooter
- William Marsden (surgeon), English surgeon
- William Marsden (footballer, born 1871), English footballer
- Billy Marsden, English international footballer
- William Milnes Marsden, British solicitor and philatelist