Lieutenant-Colonel William Boynton (14 July 1641 – 17 August 1689) was an English Member of Parliament.

He was the eldest son of Sir Francis Boynton, 2nd Baronet of Barmston.

He entered Parliament in 1680 as member for Hedon, remaining an MP until 1685.

Dying before his father, he never succeeded to the baronetcy. He married Elizabeth Bernard, daughter of John Bernard of Hull, and they had three children:

• Griffith Boynton (1664–1731), who succeeded as 3rd Baronet in 1695.
• Mary
• Constance, who married Richard Kirkshaw

• Leigh Rayment's Peerage Pages ^{[self-published source] [better source needed]}
• Boynton Pedigree

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