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- William Kent Marples
- William Kenworthy
- William Kenyon and Sons
- William Kerby
- William Kerfoot
- William Kerr
- William Kerr (1872-1959)
- William Kerr (2)
- William Kerr (b.1872)
- William Kersey and Co
- William Kershaw and Co
- William Kerswell
- William Kerswill
- William Ketland and Co
- William Kidd
- William Kidd Davis
- William Kilburn
- William Kilburn (of Leeds)
- William Kilby
- William Kilner
- William Kilpatrick
- William Kilvington
- William King-Noel
- William King (1839-1916)
- William King (WW1)
- William King (of Birmingham)
- William King Baker
- William King and Co
- William Kingdon
- William Kingdon Clifford
- William Kingham
- William Kingham and Son
- William Kingham and Sons
- William Kinghorn
- William Kinghorn and Co
- William Kingo Armstrong
- William Kingsland
- William Kingston
- William Kinninmond Burton
- William Kinross and Sons
- William Kirby
- William Kirby and Co (Stockport)
- William Kirkby
- William Kirkby Peace
- William Kirkhouse
- William Kirkip
- William Kirtley
- William Kish
- William Kitching
- William Kitson
- William Kitson Stent
- William Knapton
- William Knight
- William Knight (d.1915)
- William Knighton
- William Knott
- William Knott and Son
- William Knottesford
- William Knowles
- William Knowles (1851-1906)
- William Knowles (Bebington)
- William Knowles and Son
- William Knowlings
- William Knox (1829-1901)
- William Knox (1859-1934)
- William Knox Laurence
- William Krebs
- William L. Batt
- William L. Doward
- William L. Galloway
- William L. Kinmond
- William L. Marrian
- William Ladd
- William Laidlaw and Sons
- William Laird
- William Laird (1780-1841)
- William Laird (1816-1891)
- William Laird (1830-1901)
- William Laird (1831-1899)
- William Laird Clowes
- William Laird and Son
- William Lamb (3)
- William Lamb Arrowsmith
- William Lambert
- William Lambert (3)
- William Lambert Baines
- William Lambie
- William Lambshead (1848-1932)
- William Lambshead (1884-1966)
- William Lambton Lawson
- William Laming
- William Lancaster Owen
- William Landell
- William Landless
- William Lane
- William Lang
- William Lang, Junior and Co
- William Langabeer
- William Langdon
- William Langdon (1846-1933)
- William Langford
- William Langford (of Manchester)
- William Langley
- William Langshaw
- William Langton Coke
- William Lanham
- William Lansdowne Beale
- William Lant Carpenter
- William Larke
- William Lassell
- William Last
- William Latham
- William Launcelot Crosbie Trench
- William Laurence Turner
- William Laurence Woodcock
- William Laurillard
- William Lavender James
- William Law
- William Law Watson
- William Law Wood
- William Lawday
- William Lawes Cole
- William Lawford
- William Lawley
- William Lawley (1844-1929)
- William Lawrence
- William Lawrence Charles Somers
- William Lawrence Earnshaw
- William Lawrence Hardman
- William Lawrence Stephenson
- William Lawrence Turner
- William Lawrence Wildy
- William Lawrence Williams
- William Lawrence and Sons
- William Lawrie Turnbull
- William Lawson
- William Lawson's Whisky
- William Lawson Austin
- William Lawson and Sons
- William Lawton
- William Lawton Goodman
- William Lawton and Co
- William Laxon
- William Laxton
- William Laycock and Sons
- William Le Lacheur and Son
- William Le Roy Emmet
- William Lea
- William Lea (of Birmingham)
- William Lea (of Southport)
- William Lea Motor Car Depot
- William Lea Motor Co
- William Leach
- William Leahy
- William Lean
- William Leatham
- William Leckie Ewing McLean
- William Leckie Robinson
- William Lee
- William Lee, Son and Co
- William Lee (1563-1614)
- William Lee (2)
- William Lee (3)
- William Lee (of Dronfield)
- William Lee (of Lee and Hunt)
- William Lee and Son
- William Lee and Sons
- William Leech
- William Leech (Builders)
- William Leeding
- William Leefe Robinson
- William Lees
- William Lees (1869-1925)
- William Lefevre
- William Leftwich
- William Leggett
- William Leggett Harris
- William Leigh Bernard
- William Leighton Jordan
- William Leighton Jordon
- William Leitch
- William Lemon
- William Leng
- William Lennard
- William Leonard Baldwin
- William Leonard Barber
- William Leonard Carter
- William Leonard Harrild
- William Leonard Madgen
- William Leonard Pullen
- William Leonard Sharp
- William Leonard Wills
- William Leonard Wippell
- William Leslie
- William Leslie (1802-1879)
- William Leslie Ashton
- William Leslie Dawson
- William Leslie Kerby
- William Leslie Maunders
- William Leslie Scott
- William Letheren
- William Letts
- William Levene
- William Levett and Co
- William Lewin
- William Lewis
- William Lewis (2)
- William Lewis (London)
- William Lewis (d.1915)
- William Lewis (of Bath)
- William Lewis (of Manchester)
- William Lewis (of Wolverhampton)
- William Lewis Baker
- William Lewis Harliss
- William Lewis Wishart
- William Lewis and Sons
- William Lewis and Sons (of London)
- William Liddell and Co
- William Lilley Boon
- William Lindley
- William Lindley (d.1902)
- William Lindsay Sinclair Low
- William Lindsey-Badcock
- William Lionel Hichens
- William Lionel Jenkins
- William Lionel Treadway Brown
- William List and Son
- William List and Sons
- William Lister
- William Lister (of Hope Town)
- William Lister (of Hope Town): Etherley
- William Lister (of Hope Town): Middlesbro
- William Lister (of Hope Town): Ocean
- William Lister Newcombe
- William Lister and Sons
- William Lithgow
- William Littell Darling
- William Little and Sons
- William Littlejohn Philip
- William Littleton Randall
- William Littleton Randell
- William Littlewood
- William Littlewood (of Darnell)
- William Livingstone Paynter
- William Lizard
- William Llewellin
- William Llewellyn
- William Llewellyn Preece
- William Lloyd
- William Lloyd's Cycles
- William Lloyd (2)
- William Lloyd (Ireland)
- William Lloyd Bayley
- William Lloyd Jones
- William Lloyd Wise
- William Loader Allchin
- William Loake
- William Lochiel Sapte Lovett Cameron
- William Locke
- William Locker
- William Lockhart Bone
- William Lockwood
- William Lodge
- William Loebinger
- William Logan
- William Logan (c1882-1952)
- William Lomas Joy
- William Long
- William Longley
- William Longman Watson
- William Longshaw and Sons
- William Longstaff
- William Longworth and Sons
- William Lonnon
- William Lonsdale Drummond
- William Lord
- William Lord (1882-1941)
- William Lorenzo Collins
- William Lorimer
- William Lorimer (1876-1954)
- William Lort
- William Losh
- William Lougher
- William Louis Samengo-Turner
- William Lovelace
- William Low
- William Low (2)
- William Lowe
- William Lowe (2)
- William Lowe Lowe-Brown
- William Lowrie
- William Lowrie Sleigh
- William Lowther
- William Loy and Co
- William Lucas
- William Lucy
- William Lucy (1837-1873)
- William Lucy (1838-1873)
- William Lumb
- William Lumisden Strange
- William Lupton and Co
- William Luscombe
- William Luson Thomas
- William Luxmore Jones
- William Luxon
- William Lyall
- William Lyall Powrie
- William Lyman
- William Lynd and Co
- William Lynde Brunton
- William Lyon Mackenzie
- William Lyons
- William Lyster Holt
- William M'Ivor Morrison
- William M'Onie
- William M. Alston
- William M. Burden
- William M. Cowen
- William M. Cunningham
- William M. Heynes
- William M. Hodges
- William M. Pierce
- William M. Shaw
- William M. Sweet
- William M. Warner
- William Maberly Llewellin
- William MacGeorge
- William MacGregor
- William MacLeod and Co
- William MacNay
- William Mace
- William Macgeorge
- William Macglashan
- William Mackay
- William Mackean
- William Mackenzie
- William Mackenzie (1886-1966)
- William Mackenzie (of Birmingham)
- William Mackenzie and Co
- William Mackie
- William Mackie and Co
- William Mackinnon
- William Mackintosh and Co
- William Macklin
- William Maclean, Sons and Co