| UK Unionist Party |
UKUP |
Formed 1995. Registered 14 January 1999. Dissolved 2008. MNIS Party ID 39. Electoral Commission ID PP107 (NI). |
| Ulster Popular Unionist Party |
UPUP |
Formed 1980. Dissolved 1995. MNIS Party ID 36. |
| Ulster Unionist Party |
UUP |
Formed 3 March 1905. Registered 14 January 1999. Preceded by Irish Unionist Alliance. MNIS Party ID 38. Electoral Commission ID PP83. |
| Unionist |
Unionist |
|
| Union Movement |
UM |
Formed 1948. Dissolved 1973. Preceded by British Union of Fascists. Succeeded by National Front (merger). |
| United Ulster Unionist Council |
UUUC |
Formed January 1974. Dissolved 1977. Electoral agreement between the Ulster Unionist Party, the Democratic Unionist Party and the Vanguard Unionist Progressive Party. |
| Unity |
Un |
Political label used by Nationalist Westminster candidates in border areas in the 1960s - 1970s. MNIS Party ID 20. |
| Vanguard Unionist Progressive Party |
VUPP |
Formed 1972. Dissolved 1978. Also known as Ulster Vanguard. Preceded by Ulster Unionist Party (split). Succeeded by Ulster Unionist Party (merger). MNIS Party ID 42. |
| Veritas |
Ver |
Formed 2005. Registered 28 January 2005. Dissolved 5 May 2015. Preceded by UK Independence Party (split). Succeeded by English Democrats (merger). Electoral Commission ID PP425 (NI), PP424 (UK). |
| Whigs |
Whig |
Formed 1678. Dissolved 1859. Preceded by the Roundheads and Kirk Party. Succeeded by the Liberal Party (merger). |
| Workers Party of Britain |
WPB |
Formed 2019. Registered 22/04/2020. Also known as the Workers Party of Great Britain. MNIS Party ID 1042. Electoral Commission ID PP11382. |