Illyricum

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