- William Cooper Jr.
- William Corcoran
- William Cornachio
- William Cornelius
- William Crosbie
- William Curry
- William Curry
- William Curry
- William Curtin
- William Dace
- William Dakin
- William Dangelo, III
- William Data Systems Acquired By Precisely
- William Davidow
- William Davis
- William Davis
- William Davis
- William Davis
- William Davis
- William Davis
- William Davison
- William de Laszlo
- William de Wulf
- William Demas
- William Demlong
- William Denny
- William Derrough
- William Destefano
- William Deveau
- William Dietz
- William Dillon-Leetch
- William Donovan
- William Doran
- William Doroh
- William Dorsey
- William Dowden, III
- William Dowling
- William Downing
- William Downing
- William Doyle
