William Cecil
William Cecil may refer to:
- Lord William Cecil , British royal courtier
- Lord William Cecil , Bishop of Exeter, 1916–1936
- William Cecil, 1st Baron Burghley, English politician and advisor to Elizabeth I
- William Cecil, 2nd Earl of Exeter, Knight of the Garter
- William Cecil, 2nd Earl of Salisbury, Knight of the Garter
- William Cecil, 3rd Marquess of Exeter, member of the Privy Council of the United Kingdom
- William Cecil, 5th Marquess of Exeter, recipient of the Territorial Decoration
- William Cecil, 7th Marquess of Exeter, son of William Cecil, 5th Marquess of Exeter
- William Cecil, 17th Baron de Ros, Baron in the Peerage of England
- William Amherst Vanderbilt Cecil, operator of the Biltmore Estate
- William Cecil Ross, politician in Manitoba, Canada
- William Cecil Slingsby, English mountain climber and alpine explorer