- William Lentine
- William Levine
- William Lewis
- William Lindström
- William Lo
- William Lutkins
- William Lynch
- William Lyon Homes Acquisitions
- William M. Bird and Company Acquisitions
- William Macaulay
- William Maher
- William Malpica
- William Marraccini
- William Marshall
- William Maslechko
- William May
- William McBride Jr.
- William Mccartney
- William McDiarmid
- William McDonough
- William McGugin
- William McKee
- William Mckinley
- William Mckinley
- William McLean
- William McMullan
- William McMullen
- William Mcnairy
- William Means
- William Meehan
- William Meunier
- William Meyer
- William Miller
- William Miller
- William Miller
- William Mills
- William Mills
- William Miltenberger
- William Mitchem
- William Montgomery
