Viscount Thurso, of Ulbster in the County of Caithness, is a title in the Peerage of the United Kingdom. It was created in 1952 for the Scottish Liberal politician and former Secretary of State for Air, Sir Archibald Sinclair, 4th Baronet. His son, the second Viscount, served as Lord Lieutenant of Caithness from 1973 to 1995. As of 2009 the titles are held by the latter's son, the third Viscount, who succeeded in 1995. Known as John Thurso, he is a Liberal Democrat politician. Thurso lost his seat in the House of Lords after the passing of the House of Lords Act 1999. However, he was elected to the House of Commons in 2001, thereby becoming the first hereditary peer of the United Kingdom allowed to sit in the Commons without first disclaiming his title.
The Sinclair Baronetcy, of Ulbster in the County of Caithness, was created in the Baronetage of Great Britain in 1786 for the first Viscount's great-great-grandfather, the Scottish politician and writer John Sinclair. Both his son, the second Baronet, and grandson, the third Baronet, represented Caithness in the House of Commons. The latter was the grandfather of the fourth Baronet, who was elevated to the peerage as Viscount Thurso in 1952.
Sinclair Baronets, of Ulbster (1786)
- Sir John Sinclair, 1st Baronet (1754–1835)
- Sir George Sinclair, 2nd Baronet (1790–1868)
- Sir John George Tollemache Sinclair, 3rd Baronet (1824–1912)
- Sir Archibald Henry MacDonald Sinclair, 4th Baronet (1890–1970) (created Viscount Thurso in 1952)
Viscounts Thurso (1952)
- Archibald Henry Macdonald Sinclair, 1st Viscount Thurso (1890–1970)
- Robin Macdonald Sinclair, 2nd Viscount Thurso (1922–1995)
- John Archibald Sinclair, 3rd Viscount Thurso (b. 1953)
The heir apparent is the present holder's son the Hon. James Alexander Robin Sinclair (b. 1984)
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- Kidd, Charles, Williamson, David (editors). Debrett's Peerage and Baronetage (1990 edition). New York: St Martin's Press, 1990,[page needed]
- Leigh Rayment's Peerage Pages [self-published source][better source needed]