The Euphrasian Basilica (Croatian: Eufrazijeva bazilika, Italian: Basilica Eufrasiana) or the Cathedral Basilica of the Assumption of Mary is a Roman Catholic basilica in the Istrian town of Poreč, Croatia. The episcopal complex, which comprises the basilica itself, a sacristy, a baptistery and the bell tower of the nearby archbishop's palace, is an excellent example of early Byzantine architecture in the Mediterranean region.