Unionist Party may refer to:
United Kingdom
- Conservative and Unionist Party, the formal name of the Conservative Party
- Liberal Unionist Party, existed from 1886 to 1912
- Unionist government, 1895–1905, a coalition government of the two parties
Northern Ireland
Current organisations
- Democratic Unionist Party (DUP), the larger of the two main unionist political parties in Northern Ireland
- Ulster Unionist Party (UUP), the smaller and more moderate of the two main unionist political parties in Northern Ireland
- Progressive Unionist Party (PUP), minor loyalist party formed in 1979
- Traditional Unionist Voice (TUV), minor loyalist party formed in 2007
- Ulster Unionist Labour Association (or Labour Unionist Party)
Defunct organisations
- Protestant Unionist Party, former political party formed by Ian Paisley in 1966 out of the Ulster Protestant Action (UPA) movement
- Independent Unionist Association (or Independent Unionist Party), existed from 1937 to late 1940s
- Vanguard Unionist Progressive Party (Ulster Vanguard), existed from 1973 and 1978
- Unionist Party of Northern Ireland, existed from 1974 and 1981
- United Ulster Unionist Party, existed from 1975 and 1982, splinted from the Vanguard Progressive Unionist Party due to a disagreement over power-sharing
- Ulster Popular Unionist Party, existed from 1980 to 1995
- UK Unionist Party, existed 1995 to 2008
- Northern Ireland Unionist Party, existed 1999 to 2008
Scotland
- Unionist Party (Scotland), centre-right party which existed between 1912 and 1965, the dominant force in Scottish politics until the late 1950s
- Scottish Conservative and Unionist Party, the full name of the party since 1965 more often called the Scottish Conservative Party
- Scottish Unionist Party (1986), Scottish minor party of traditionalist Unionists disillusioned with the Conservative government's signing of the Anglo-Irish Agreement
India (under British rule)
- Unionist Party (Punjab), a major political party in the former Punjab Province until 1947
Canada
- Unionist Party (Canada), existed from 1917 to 1920
- Unionest Party
Croatia
- Unionist Party (Kingdom of Croatia), existed from 1861 to 1918
Denmark
Faroe Islands
Greenland
Egypt
Guatemala
Nicaragua
South Africa
Thailand
- Sahaphum Party ("Unionist Party" in English)