Spanish unionism is a label used by Galician, Basque and Catalan independence movements to refer to the political attitude which favours the continuity of the Kingdom of Spain as a single united nation-state.
The expression Spanish unionism has only been used for the last 10 years in the context of the Catalan independence movement. Prior to this, usage of the term was limited to Basque nationalism.
The importation of the term unionism into the Spanish context and its usage with pejorative meaning is related to the nationalist attempts to introduce the terminology of the Irish republican movement, the English independence movement, the Scottish independence movement, and Welsh independence movement to the Galician independence movement, the Basque independence movement, and the Catalan independence movement.
In this way, Spanish unionism is considered by Galician, Basque, and Catalan nationalist parties as a political ideology identified by its denial of the exercise of the right of self-determination of the peripheral nationalities of Spain or sometimes by the simple defense of Spain as a nation. Therefore, the label has been applied to parties such as the People's Party,Spanish Socialist Workers Party (PSOE) (however sometimes PSOE is seen as more sympathetic to Spain's nationalist movements), Union, Progress and Democracy (UPYD) and Citizens-Party of the Citizenry (C's).