| William Kamkwamba | William Kanerva | William Karel |
| William Katt | William Keane | William Keeler |
| William Keeling | William Keighley | William Kemmler |
| William Kemp | William Kempe | William Kennedy |
| William Kennedy Dickson | William Kennedy Laurie Dickson | William Kidd |
| William Kiefer | William Kilpatrick | William Kim |
| William King | William King Thomas | William Kingdon Clifford |
| William Kinnear | William Kiplagat | William Kipsang |
| William Kipsang Rop | William Kirby | William Kircher |
| William Kirkpatrick | William Kissam Vanderbilt | William Kissam Vanderbilt II |
| William Klaus | William Klein | William Knollys |
| William Knowles | William Knox D'Arcy | William Kotzwinkle |
| William Kouwenhoven | William Kraan | William Kraft |
| William Kraft (componist) | William Kristol | William Kruskal |
| William Kvist | William Kvist Jørgensen | William Kvist Jorgensen |
| William Kwong Yu Yeung | William L. Petersen | William L. Shirer |
| William Labov | William Lamb | William Lamb Melbourne |
| William Lamb, 2e burggraaf Melbourne | William Lamb, 2nd Viscount Melbourne | William Lamb, 2nd Viscount Melbourne) |
| William Lambton | William Land Park | William Lane Craig |
| William Langland | William Lanne | William Larned |
| William Lashly | William Lashner | William Lassell |
| William Laud | William Lava | William Lawes |
| William Lawrence Bragg | William Lawvere | William Le Baron Jenney |
| William Le Roy Emmet | William Leahy | William Leandersson |
| William Lee | William Lee Stokes | William Legge |
| William Legge (1949) | William Lemaire | William Lemke |
| William Lenoir | William Leo Kalkhoven | William Leonard Roberts II |
| William Leslie | William Lester | William Levada |
| William Lewis | William Lewis (chemicus) | William Lewis (schaker) |
| William Lilljeborg | William Lilly | William Lindsay Windus |
| William Lipscomb | William Livingston | William Lloyd Garrison |
| William Lockwood | William Lodewijk Gerard Lemaire | William Lok |
| William Lombardy | William Longespée | William Louis Abbott |
| William Lovelock | William Lucas Distant | William Lucking |
| William Lundigan | William Lutley Sclater | William Lyall |
| William Lyle Richardson | William Lynch | William Lyon Mackenzie King |
| William Lyttle | William M. Jennings Trophy | William M. Tweed |
| William Mackie | William Mackie (1799-1860) | William MacMaster Murdoch |
| William Maddison | William Maeyer | William Mahone |
| William Makdowell | William Makepeace Thackeray | William Makram Ebeid |
| William Malone | William Man A Hing | William Mangion |
| William Mapother | William Mark Felt | William Mark Whitten |
| William Marlin | William Marshal | William Marshall |
| William Marten Westerman | William Martin | William Martin (atleet) |
| William Martin (politicus) | William Masters | William Mathias |
| William Matthew | William Matthew Flinders Petrie | William Matthijssen |
| William Maurice Ewing | William Maw Egley | William Maxwell |
| William McArthur | William McCauley | William McCool |
| William McDonough | William McElcheran | William McGonagall |
| William McGregor Paxton | William McKinley | William McKinley Inauguration Footage |
| William McKinney | William McMahon | William McMillan |
| William McNamara | William McNeill | William McPhail |
| William McTaggart | William Melling | William melling |
| William Mensah | William Merritt Chase | William Meynard |
| William Michael Rossetti | William Mikelbrencis | William Miller |
| William Miller (econoom) | William Miller (predikant) | William Millerson |
| William Mills | William Minor | William Moerner |
| William Monahan | William Moore | William Moorlag |
| William More Gabb | William Morgan | William Morgan (Bijbelvertaler) |
| William Morgan (wiskundige) | William Morris | William Morris (ontwerper) |
| William Morris (schrijver) | William Morris Davis | William Morrison |
| William Moseley | William Mountbatten-Windsor | William Moylan |
| William Mueller | William Mulready | William Mundy |
| William Munro | William Murdoch | William Murdoch (ingenieur) |
| William Murphy | William Murphy jr. | William Murrill |
| William Mutwol | William Myron Keck observatorium | William Myron Keck-observatorium |
| William Nachtegael | William Nassau de Zuylestein | William Nassau de Zuylestein (1645) |
| William Nassau de Zuylestein (1645-1709) | William Nassau de Zuylestein (1649-1708) | William Nassau de Zuylestein (1682-1710) |
| William Nassau de Zuylestein (1717) | William Nassau de Zuylestein (1717-1781) | William Nassau de Zuylestein (1754-1830) |
| William Nassau de Zuylestein, 1e graaf van Rochford | William Nassau de Zuylestein, 2e graaf van Rochford | William Nassau de Zuylestein, 4e graaf van Rochford |
| William Nathan Schoenfeld | William Nicholson | William Nicholson (chemicus) |
| William Nicholson (scheikundige) | William Nordhaus | William Nunn Lipscomb |
| William Nylander | William O'Brien | William O'Connor |
| William O'Leary | William O. Smith | William Oberlaender |
| William Oberlander | William Oberländer | William Oefelein |
| William of Newburgh | William of Nottingham | William of Orange |
| William of Orange (duif) | William Onyeabor | William Orbit |
| William Orie | William Orpen | William Orthwein |
| William Ortiz | William Ortiz Alvarado | William Ortiz-Alvarado |
| William Oughtred | William Overton Smith | William Owens |
| William Owusu | William Owusu Acheampong | William P. Barr |
| William P. Fessenden | William P. Gottlieb | William P. Latham |
| William P. Murphy Jr. | William P. Murphy jr. | William P. Rogers |
| William Paats | William Pacho | William Pailes |
| William Palacio | William Palacio Navarro | William Paley |
| William Palmer | William Palmer (seriemoordenaar) | William Parker |
| William Parr | William Parr (1e baron Parr of Horton) | William Parr (1e markgraaf van Northampton) |
| William Parr (1e markies van Northampton) | William Parr, 1e baron Parr of Horton | William Parr, 1e markgraaf van Northampton |
| William Parry | William Parry Murphy | William Parsons |
| William Parsons Rosse | William Paterson | William Paterson University |
| William Patrick Hitler | William Patrick Stuart-Houston | William Peacock |
| William Peden | William Penn | William Percy Sharpe |
| William Perkins | William Perlberg | William Perry |
| William Peter Blatty | William Peters | William Peters Latham |
| William Petersen | William Petersson | William Petty |
| William Petty (1737-1805) | William Petty (2e graaf van Shelburne) | William Petty (econoom) |
| William Petty, 2e Graaf van Shelburne | William Petty, 2nd Earl of Shelburne | William Philip Schreiner |
| William Phillips | William Phillips (econoom) | William Phillips (geoloog) |
| William Pierce Rogers | William Pit de Oudere | William Pitt |
| William Pitt de Jongere | William Pitt de jongere | William Pitt de Oudere |
