Over the last three decades a great deal of research has been carried out in an attempt to explain the electoral performance of radical right parties in Europe. Most approaches concentrate on demand-side determinants and have some limitations. We compensate for these shortcomings and focus on the context of party competition and supply-side determinants (consistency of ideological discourse, functioning party propaganda, the continuity of the leader in office and strong party organization) to explain the electoral success of radical right parties in post-communist Europe. We conducted our analysis at party level in nine radical right parties in four countries from Central and Eastern Europe (Bulgaria, the Czech Republic, Hungary and Romania) between 1990 and 2014. The bivariate and multivariate (ordinal logistic regression) analyses draw on unique data collected from primary and secondary sources.