Archibald Sinclair, 1st Viscount Thurso
| The Viscount Thurso | |
|---|---|
| Archibald Sinclair as Secretary of State for Air during World War II | |
| Leader of the Liberal Party | |
| In office 26 November 1935 – 26 July 1945 | |
| Deputy | Percy Harris (1940–1945) | 
| Preceded by | Herbert Samuel | 
| Succeeded by | Clement Davies | 
| Secretary of State for Air | |
| In office 11 May 1940 – 23 May 1945 | |
| Monarch | George VI | 
| Prime Minister | Winston Churchill | 
| Preceded by | Sir Samuel Hoare, Bt | 
| Succeeded by | Harold Macmillan | 
| Deputy Leader of the Liberal Party | |
| In office 4 November 1931 – 26 November 1935 | |
| Leader | Herbert Samuel | 
| Preceded by | Herbert Samuel | 
| Succeeded by | Percy Harris 1940–1945 | 
| Secretary of State for Scotland | |
| In office 25 August 1931 – 28 September 1932 | |
| Monarch | George V | 
| Prime Minister | Ramsay MacDonald | 
| Preceded by | William Adamson | 
| Succeeded by | Sir Godfrey Collins | 
| Liberal Chief Whip | |
| In office 1930 – 25 August 1931 | |
| Leader | David Lloyd George | 
| Preceded by | Robert Hutchison | 
| Succeeded by | Goronwy Owen | 
| Member of the House of Lords Lord Temporal | |
| In office 7 July 1954 – 15 June 1970 Hereditary Peerage | |
| Preceded by | Peerage created | 
| Succeeded by | The 2nd Viscount Thurso | 
| Member of Parliament for Caithness and Sutherland | |
| In office 15 November 1922 – 5 July 1945 | |
| Preceded by | Leicester Harmsworth | 
| Succeeded by | Eric Gandar Dower | 
| Personal details | |
| Born | Archibald Henry Macdonald Sinclair 22 October 1890 Chelsea, London, England or Caithness, Scotland | 
| Died | 15 June 1970 (aged 79) Twickenham, London, England | 
| Political party | Liberal | 
| Spouse | Marigold Forbes  (m. 1918) | 
| Alma mater | Royal Military College, Sandhurst | 
| Signature | |
Archibald Henry Macdonald Sinclair, 1st Viscount Thurso, KT, CMG, PC (22 October 1890 – 15 June 1970), known as Sir Archibald Sinclair between 1912 and 1952, and often as Archie Sinclair, was a British politician and leader of the Liberal Party.