William Herbert (gwahaniaethu)

Gallai William Herbert gyfeirio at un o nifer o bobl:

 William Herbert, Iarll 1af Penfro (1423–1469) (Iarllaeth Gyntaf Penfro)
 William Herbert, 2il Iarll Penfro (1451–1491)
 William Herbert, Iarll 1af Penfro (1501–1570) (Ail Iarllaeth Penfro, 1551) 
 William Herbert, 3ydd Iarll Penfro (1580–1630)
 William Herbert, 6ed Iarll Penfro (1642–1674)
 William Herbert, 18fed Iarll Penfro (1978- )