Sir William St Quintin, 3rd Baronet (c. 1662 – 30 June 1723), of Harpham in Yorkshire, was an English merchant and Whig politician who sat in the House of Commons from 1695 to 1723.
St Quintin was the eldest son of William St Quintin of Muston and his wife Elizabeth Strickland, daughter of Sir William Strickland of Boynton.
St Quintin belonged to one of the leading merchant families in Hull, and was an active member of the corporation.
[3] St Quintin died unmarried on 30 June 1723, and was succeeded in the baronetcy by his nephew William.
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