William Douglas
William Douglas may refer to:
Earls and Dukes of Queensberry
- William Douglas, 1st Earl of Queensberry, Scottish nobleman
- William Douglas, 1st Duke of Queensberry, Scottish nobleman and politician, grandson of the above
- William Douglas, 4th Duke of Queensberry, Scottish nobleman, great-grandson of the above
Earls of Angus
- William Douglas, 2nd Earl of Angus, Scottish nobleman and soldier, grandson of the 1st Earl of Douglas
- William Douglas, 9th Earl of Angus, Scottish nobleman and supporter of Mary, Queen of Scots
- William Douglas, 10th Earl of Angus, Scottish nobleman, son of the above
- William Douglas, 1st Marquess of Douglas and 11th Earl of Angus, Scottish nobleman, son of the above
Earls of Douglas
- William Douglas, 1st Earl of Douglas, Scottish nobleman, grandson of William le Hardi, Lord of Douglas
- William Douglas, 6th Earl of Douglas, Scottish nobleman
- William Douglas, 8th Earl of Douglas, Scottish nobleman, cousin of the above
Earls of Morton
- William Douglas, 6th Earl of Morton, Scottish nobleman
- William Douglas, 7th Earl of Morton, Scottish nobleman, grandson of the above
Lords of Douglas
- William I, Lord of Douglas, medieval nobleman of Flemish origin
- William Longleg, Lord of Douglas, Scoto-Norman nobleman, grandson of the above
- William le Hardi, Lord of Douglas, Scottish soldier and governor of Berwick Castle, son of the above
- William IV, Lord of Douglas, Scottish nobleman, grandson of the above
Other nobles and knights
- William Douglas, Lord of Liddesdale, Scottish nobleman and soldier, cousin of the 1st Earl of Douglas
- Sir William Douglas of Nithsdale, Scottish knight
- Sir William Douglas of Drumlanrig, Scottish knight, grandson of the 1st Earl of Douglas
- Sir William Douglas of Glenbervie, Scottish knight killed at the Battle of Flodden
- William Douglas, 2nd Lord Mordington, Scottish nobleman, grandson of the 10th Earl of Angus
- Sir William Douglas of Kelhead, Scottish Covenanter colonel, son of the 1st Earl of Queensberry
- William Hamilton, Duke of Hamilton, Scottish nobleman and politician, son of the 1st Marquess of Douglas
- William Douglas, 14th of Cavers , Scottish landowner and politician, MP for Roxburghshire 1715–22, 1727–34, 1742–47, and for Dumfries Burghs 1722–27
- Sir William Douglas, 4th Baronet, Scottish landowner and politician, MP for Dumfries Burghs, great-great-grandson of Sir William Douglas of Kelhead
- Sir William Douglas, 1st Baronet, Scottish mill owner, landowner and founder of Castle Douglas
- Lord William Douglas, Scottish politician and landowner, son of Sir William Douglas, 4th Baronet
Arts
- William Douglas , Scottish writer, probable author of the poem "Annie Laurie"
- William Douglas , Scottish miniature and portrait painter
- Sir William Fettes Douglas, Scottish painter
- Billy Douglas , American jazz trumpeter and vocalist
- Bill Douglas, Scottish film director
- Bill Douglas , Canadian composer, pianist and bassoonist
Law
- William O. Douglas, United States Supreme Court justice
- Sir William Randolph Douglas, Chief Justice of Barbados
Military
- William Douglas of Kirkness, Scottish general and politician
- William Douglas , American military officer during the American Revolutionary War
- Sir William Douglas , British Army general in the War of 1812
- Sir William Douglas of Balgillo, British Army officer during the Napoleonic Wars
- William Bloomfield Douglas, Royal Navy officer and colonial official
- Sir William Douglas , British Army general in the First World War
- Sholto Douglas, 1st Baron Douglas of Kirtleside, Marshal of the Royal Air Force
Politics
- William Lewis Douglas, governor of Massachusetts, 1905–1906
- William Douglas, member of the Legislative Assembly of New Brunswick, 1886–1892
- William H. Douglas, U.S. Representative from New York
- Billy Douglas , unionist activist from Northern Ireland
- William Douglas , Orangeman and Assembly member
Sports
- William Douglas , New Zealand cricketer
- Billy Douglas , Welsh rugby union player
- William Douglas, Scottish footballer for Newton Heath and Blackpool
- William Douglas , Scottish footballer for Queen's Park
- Bill Douglas , Australian rugby union player
- William Douglas , New Zealand cricketer
- William Douglas, Scottish footballer for Montrose, Brechin City, Blackburn Rovers, Dick, Kerr's XI and Rochdale in the 1930s
- William Douglas , American boxer
Others
- William Douglas , Scottish and American maritime fur trader
- William Douglas , Church of England priest, Archdeacon of Wilts, 1799–1804
- William Douglas , Scottish advocate and Member of Parliament for Plympton Erle, 1812–1816
- William O. Douglas, American who in 1878 received a patent for a lenticular truss bridge
Fictional characters
- Billy Douglas, fictional character on the American television series ''One Life to Live''