This article addresses the scholarly debate over sectarianism and the Provisional Irish Republican Army's (PIRA) campaign during the Northern Ireland Troubles. It argues that although there is much merit in the contributions made in this discourse, unfortunately, for, the most part, there is a lack of engagement with the deeper meaning of sectarianism. Consequently, it seeks to enhance the understanding of sectarianism within this arena before considering the nature of the PIRA campaign. By conducting a thorough analysis of the killings conducted by this organisation in the early years of the conflict it is ultimately concluded that, at the very least, PIRA tolerated, and likely sanctioned, sectarian violence from within its ranks.