Authors: W
- William of Norwich (1)
- William of Occam (2)
- William of Ockham (16)
- William of Tyre (1)
- William Oldys (1)
- William Oliver (1)
- William Orlando Darby (1)
- William Orville Douglas (5)
- William Osler (126)
- William Overgard (3)
- William P King (1)
- William P Leahy (5)
- William P. Alford (1)
- William P. Bundy (2)
- William P. Driscoll (1)
- William P. Leahy (20)
- William P. Merrill (2)
- William P. Young (102)
- William Paley (3)
- William Parks (1)
- William Parrish (1)
- William Paterson (4)
- William Patten (1)
- William Penn (203)
- William Pennington (2)
- William Pepper (3)
- William Pepperell Montague (1)
- William Perry (5)
- William Peter Blatty (35)
- William Peter Hamilton (2)
- William Petersen (27)
- William Pett Ridge (2)
- William Petty (15)
- William Pickens (7)
- William Pierce (1)
- William Pierson Merrill (1)
- William Pinnock (1)
- William Pitt (9)
- William Pitt The Younger (3)
- William Pitt, 1st Earl of Chatham (4)
- William Plomer (3)
- William Pollard (10)
- William Powell (13)
- William Prescott (3)
- William Proxmire (11)
- William Prynne (4)
- William Quigley (3)
- William R Alger (1)
- William R Inge (1)
- William R Mattox (1)