Margum may refer to the following ancient Roman places and jurisdictions in the Balkans:
Margum Dubravica, a fortress and garrison in Roman province Moesia Superior, now at Orašje hamlet in Dubravica, Serbia, at the mouth of the Great Morava on the Danube , Roman fortress on the opposite bank of the Danube near Kovin
See also Margus (disambiguation) List of Catholic dioceses in Bosnia and Herzegovina List of Catholic titular sees