Opposition to sexual minority rights in Poland is among the highest in the EU. Populist political actors in the country repeatedly scapegoat gays and lesbians, presenting them as a threat to the Polish nation and its shared norms and values, particularly those derived from religion. Building upon previous research which shows how discourse constructing homosexuality as a threat to the nation has been used by social and political actors to legitimize homophobic rhetoric and behaviour, our paper shows whether nationalism—understood here as national collective narcissism—predicts prejudice towards gays and lesbians at the level of individual beliefs.