Sir William Blackett, 2nd Baronet
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Sir William Blackett, 2nd Baronet (11 December 1690 – 25 September 1728) was a baronet and a member of the British House of Commons representing Newcastle-upon-Tyne.

Blackett was the son of William Blackett and his wife Julia Conyers. He was educated at University College, Oxford. On the death of his father in 1705, he succeeded to the Baronetcy. He was elected Member of Parliament for Newcastle in 1710, and retained the seat until 1728.

He married Barbara Villiers, daughter of the Earl of Jersey, in 1725. They had no children, although he had previously had an illegitimate daughter Elizabeth Orde. The Baronetcy became extinct upon his death. He bequeathed his estates at Allendale, Northumberland and Wallington Hall, Cambo to his nephew Sir Walter Calverley, 2nd Baronet of Calverley, conditional upon the latter's marriage to Elizabeth Orde, Blackett's natural daughter and his change of name to Blackett.