Robert Hampden-Trevor, 1st Viscount Hampden (17 February 1706 – 22 August 1783) was a British diplomat at The Hague and then joint Postmaster General.

He wrote some Latin poems which were published at Parma in 1792 as Poemata Hampdeniana.

Dr John Trevor, (1740-1796) was appointed Rector of Otterhampton in 1771, but who later moved to the Continent and eventually became Minister of the Protestant chapel at Ostend, where he died in 1796.

[3] Trevor married secondly, on 6 Feb. 1743, at The Hague, Constantia, daughter of Peter Anthony de Huybert, lord of Van Kruyningen, by whom he left four children—Maria Constantia (who married Henry Howard, 12th Earl of Suffolk), Thomas, second viscount Hampden, John Hampden-Trevor, third viscount Hampden [q. v.], and Anne.

[4] His second son, John Hampden-Trevor, 3rd Viscount Hampden (1749–1824), died only three weeks after he had succeeded his elder brother Thomas Hampden-Trevor, 2nd Viscount Hampden, when the titles became extinct.