William Henry Nassau de Zuylestein, 4th Earl of Rochford, KG, PC was a British courtier, diplomat and politician. He occupied senior ambassadorial posts at Madrid and Paris, and served as Secretary of State in both the Northern and Southern Departments. He is credited with the earliest-known introduction of the Lombardy poplar to England in 1754.
- Occupation
- diplomat, ambassador, politician
- Position held
- ambassador of the Kingdom of Great Britain in the Kingdom of Spain, Leader of the House of Lords, Lord Lieutenant of Essex
- Citizenship
- Kingdom of Great Britain
