Those (predominantly Protestant) who wish to keep Northern Ireland in union with the rest of the United Kingdom.

Unionism in Scotland is the belief in that Scotland should remain in the United Kingdom in its present structure as a union between its main constituent countries. As the predominant force in Scottish politics, there are many strands of political Unionism in Scotland, as well as sympathisers with Unionism in Northern Ireland. Unionism is a movement often categorised primarily as being in opposition to Scottish independence.