John De Ponthieu

John de Ponthieu (27 April 1765 – 26 April 1813) was an English politician who served as a member of parliament for Helston and Westbury.

Early life De Ponthieu was born on 27 April 1765. He was the second, but eldest surviving, son of Anne ( Sykes) de Ponthieu (d. 1817) and Henry de Ponthieu (1731–1808), a merchant and amateur naturalist. They lived at Princes Street, Bedford Row, Middlesex. was a member of the firm de Ponthieu and Wilkes.

His maternal grandparents were Anne ( Beaufils) de Ponthieu and Huguenot merchant, Josias de Ponthieu (son of Charles de Ponthieu, a refugee officer from Saintonge, and Marguerite de La Rochefoucauld). Through his aunt Elizabeth de Ponthieu, he was a first cousin of the banker Charles Wilkes.

Career De Ponthieu was educated by R. Bland in Bromley-by-Bow. A member of Bruce, de Ponthieu, Bazett & Co. until his death, he was shareholder and writer for the East India Company in Bombay in 1783, he was a factor in 1790 before becoming secretary and accountant to the Military Board in 1795. He returned to England by 1801 and succeeded to his father's estate in 1808.

Personal life De Ponthieu, who never married, lived at 43 Portland Place, Middlesex, and acquired a residence at Esher. He was buried at Esher with his parents. His 1803 will, which was contested by his business partners, left £20,000 to his unmarried sister Anne, who died in 1823.