Illyricum may refer to:
Illyria, a region in Southeastern Europe in classical antiquity, inhabited by ancient Illyrians Illyricum (Roman province), a Roman province that existed between 27 BC and 69/79 AD Diocese of Illyricum, a diocese of the Late Roman Empire Praetorian prefecture of Illyricum, one of four praetorian prefectures into which the Late Roman Empire was divided Illyrian Provinces, an autonomous province of France during the First French Empire 1809-1814 Illyricum sacrum, a classic eight volume historical work, published from 1751 to 1819
Species and subspecies Pancratium illyricum, a flowering plant species Polystichum illyricum, a fern hybrid species Onopordum illyricum
See also Illyricus (disambiguation) Illyrians (disambiguation) Illyrian (disambiguation) Illyria (disambiguation) Illyricvm, 2022 historical film with reconstructed Illyrian language