- William Thompson
- William Thompson
- William Thorndike
- William Thorndike Jr.
- William Thuston
- William Tice
- William Timmerman
- William Tobin
- William Tomai
- William Tomai
- William Tran
- William Trevelyan Thomas
- William Tully
- William Voss
- William W.
- William W. Archer
- William Wachtel
- William Wagner
- William Waldrip
- William Wang
- William Wardlaw
- William Watkins
- William Watts
- William Watts
- William Weatherford
- William Weigand
- William Wells
- William Westervelt
- William Wetmore
- William White
- William Wilson Holdings Acquired By Ferguson
- William Winterer
- William Witzofsky
- William Wong
- William Woo
- William Wood
- William Woolsey
- William Worden
- William Wright
- William Yates
