William Blackett
William Blackett may refer to:
- Sir William Blackett, 1st Baronet, of Newcastle, English merchant and MP
- Sir William Blackett, 1st Baronet, of Newcastle-upon-Tyne, English MP, son of the above
- Sir William Blackett, 2nd Baronet, English MP, son of the above
- Sir William Blackett, 5th Baronet, British baronet