| Scottish Labour Party |
SLP |
Formed 18 January 1976. Dissolved 1981. |
| Scottish National Party |
SNP |
Formed 7 April 1934. Registered 14 January 1999. Preceded by the National Party of Scotland and Scottish Party (merger). MNIS Party ID 29. Electoral Commission ID 102. |
| Scottish Parliamentary Labour Party |
SPLP |
Formed 25 August 1888. Dissolved 1895. Succeeded by Scottish Labour (part of the UK Labour Party). |
| Scottish Prohibition Party |
SPP |
Formed 1901. Dissolved 1935. |
| Scottish Workers Parliamentary Elections Committee |
SWPEC |
Formed 1899. Dissolved 1909. Later known as Scottish Workers' Representation Committee (1903-). Succeeded by Labour Party (merger). |
| Sinn Féin |
SF |
Formed 28 November 1905. Registered 14 January 1999. MNIS Party ID 30. Electoral Commission ID PP39. |
| Social Democratic and Labour Party |
SDLP |
Formed 21 August 1970. Registered 14 January 1999. Preceded by the Republican Labour Party and the National Democratic Party. MNIS Party ID 31. Electoral Commission ID PP55 (NI). |
| Social Democratic Federation |
SDF |
Formed 1881. Dissolved 1911. Preceded by Manhood Suffrage League. Succeeded by British Socialist Party (merger). |
| Social Democratic Party |
SDP |
Formed 26 March 1981. Dissolved 3 March 1988. Preceded by Labour party (split). Succeeded by the Social Democratic Party (split) and the Liberal Democrats (merger). MNIS Party ID 32. Electoral Commission ID PP243. |
| Speaker |
Spk |
MNIS Party 47. |