List of excommunicable offences in the Catholic Church

This is a list, in chronological order, of present and past offences to which the Catholic Church has attached the penalty of excommunication; the list is not exhaustive. In most cases these were "automatic excommunications", wherein the violator who knowingly breaks the rule is considered automatically excommunicated from the Church regardless of whether a bishop (or the pope) has excommunicated them publicly.

Source: Wikipedia — List of excommunicable offences in the Catholic Church (CC BY-SA 4.0)