Decretum may refer to:

• The Decretum Gratiani is a collection of Canon law compiled in the twelfth century by a jurist named Gratian.
• Decretum Gelasianum, traditionally attributed to Pope Gelasius I, contains a list of works adjudged apocryphal.
• Decretum de Judaeis is the name given to the series of draft documents of the Second Vatican Council which led to ground-breaking progress in the Church's relations with Jews.
• The Decretum of Burchard of Worms, a collection of Canon law compiled the early eleventh century.

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