Discussion of sectarianism often focuses on evidence purporting to show discriminatory behaviour directed at Catholics or Protestants in Scotland. But attitudes also matter – in sustaining (or preventing) such discriminatory behaviours, and in understanding the nature of the ‘problem of sectarianism’ from the perspective of the Scottish public. This paper uses data from the Scottish Social Attitudes survey 2014. The survey fills a gap in the evidence base by providing robust evidence on what the public actually thinks about sectarianism in modern Scotland. It assesses public beliefs about the extent and nature of sectarianism and its perceived causes. Tensions in public opinion and differences in the attitudes of different sections of Scottish society are explored.