United Ulster Unionist Party ended in 1984.
Ulster Popular Unionist Party ended in 1995.
UK Unionist Party ended in 2008.
Liberal Unionist Party ended in 1912.
Protestant Unionist Party ended in 1971.
Ulster Democratic Party ended in 2001.
Ulster Liberal Party ended in 1987.
British Ulster Dominion Party ended in 1982.
Unionist Party of Northern Ireland ended in 1981.
Italian Unionist Movement ended in 1948.
Ulster Railway ended in 1876.
United Bahamian Party ended in 1971.
United Newfoundland Party ended in 1934.