Abstract
This thematic issue assesses the organisational forms of a broad range of right-wing populist parties (RWPPs) across Europe (12 in total). It interrogates received wisdom about the supposed leader-centeredness of such parties and investigates, in particular, the extent to which the mass party, as an organisational model, remains popular among RWPPs. This introduction presents the aims, research questions, and analytical framework of the issue and justifies its selection of cases. The resilience of the mass party model highlighted in many articles challenges the dominant trend that party organisation literature has identified: a unidirectional shift towards “catch-all,” “electoral-professional,” or “cartel” organisations.