List of excommunicable offences from the Council of Trent

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The Council of Trent was held in several sessions from 1545 to 1563. The council was convoked to help the church respond to the challenge posed by the Protestant Reformation, which had begun with Martin Luther decades earlier. The council played a large part in the revitalization of the Roman Catholic Church throughout Europe.^[1]

A number of canons assigning automatic ex-communication were enacted, which became part of the church's canon law. Heresies about the Sacraments or de fide doctrines which had been rejected or re-defined by the Protestants were specified and assigned automatic excommunication for Catholics who held them. These canons still apply today, as evidenced by the fact that the contemporary Catechism of the Catholic Church cites them as authoritative on almost every page.