Hussey Vivian, 3rd Baron Vivian

Hussey Crespigny Vivian, 3rd Baron Vivian GCMG CB DL FRGS (19 June 1834 – 21 October 1893) was a British diplomat from the Vivian family.

In 1851, he became a clerk in the Foreign Office, later travelling to Paris with George Villiers, 4th Earl of Clarendon in 1856 for the signing of the Treaty of Paris and with John Campbell, 2nd Marquess of Breadalbane to Berlin in 1861, to invest William I of Prussia with the Order of the Garter. In 1864, he was sent to Athens with a draft treaty for the transfer of the Ionian Islands to Greece and became a senior clerk in the Foreign Office in 1869.

In 1873, Vivian was sent to Alexandria as Consul-General, transferred to Bucharest a year later and returned to Alexandria in 1876. In 1878, he was appointed to the Order of the Bath as a Companion (CB). He was sent to Bern as Minister Resident in 1879 and was promoted to Envoy Extraordinary and Minister Plenipotentiary to the Swiss Confederation in 1881. Few months later, he was transferred to Copenhagen and in 1884 to Brussels, where he was appointed to the Order of St Michael and St George as a Knight Commander (KCMG) in the 1886 Birthday Honours. Having succeeded to his father's title in 1886, he was appointed to be a Deputy Lieutenant of the County of Cornwall in 1887. In the 1890 Birthday Honours, he was promoted in the Order of St Michael and St George to be a Knight Grand Cross (GCMG). His final and highest position was to Rome in 1892, where he remained until he died from pneumonia in 1893. He was sworn of the Privy Council on the year of his death.The Prince of Naples was present at his funeral.