Zachary Philip Fonnereau (London, 31 January 1706 – 15 August 1778) was a British businessman and politician, the fourth son of the merchant Claude Fonnereau.
A London merchant, he was of Huguenot extraction. He played a prominent role in financing the Seven Years' War.
By his marriage to Margaret Martyn, he left five children, the two elder of whom both entered Parliament for Aldeburgh:
- Philip Fonnereau (1739–1797)
- Martyn Fonnereau (1741–1817)
- Charlotte Fonnereau (28 January 1742 – 15 November 1806)
- Fanny Fonnereau (7 January 1744 – 10 January 1827), married George Stainforth, Jr. on 22 March 1777 at Cornhill, died without issue
- Thomas Fonnereau (21 January 1746 – 26 December 1788), married Harriet Hanson on 19 October 1786 and left issue