Batasuna (Basque: Unity, originally Herri Batasuna or "Unity of the People") was a Basque nationalist political party based mainly in Spain, where it was outlawed in 2003, after a court ruling declared proven that the party was financing ETA with public money. Batasuna is included in the "European Union list of terrorist persons and organizations" as a component of ETA. Right after having been banned, Batasuna still managed to organize or support some rallies, public actions and several workplace strikes. The Spanish ruling was appealed before and, later on, confirmed by the European Court of Human Rights.

As an association and not as a political party, Batasuna has a minor presence in the French Basque country, where it remains legal for the time being as "Batasuna".

Batasuna's ranks and support base have been represented under different names since it was first declared legal in the late 1970s with the Spanish Transition to democracy. Thus, Batasuna's predecessors were the original Herri Batasuna and, then, Euskal Herritarrok. After having been outlawed in 2003, Batasuna's core support revamped yet again by co-opting the so far marginal parties EHAK and Acción Nacionalista Vasca (ANV).