- William Haubert
- William Hausberg
- William Hawke
- William Henry
- William Heritage, Iii
- William Hermann
- William Hicks
- William Higgins
- William Hill
- William Hill
- William Hill Codere Italia Srl Acquired By Intralot S.A.
- William Hill Acquisitions
- William Hiltz
- William Ho
- William Ho
- William Ho
- William Hoffman
- William Hogarth
- William Hollaway
- William Hood
- William Hood & Company, LLC
- William Hooper
- William Hopkins
- William Hornberger
- William Hovey
- William Howard
- William Howell
- William Hsieh
- William Hughes
- William Hughes, III
- William Hunscher Jr.
- William Hurst
- William Hutchens
- William Intner
- William Isaac
- William Isaac
- William Isenhour
- William Jackson
- William Jackson Food Group Acquisitions
- William Jacobs
