The Basilica of St. John (St. Jean Aniti) was a great church in Ephesus constructed by Emperor Justinian in the 6th century. It stands over the believed burial site of St. John, who is identified as the apostle, evangelist (author of the Fourth Gospel) and prophet (author of Revelation).

The basilica is on the slopes of Ayasoluk Hill near the center of Selçuk, just below the fortress and about 3.5 km (2 miles) from Ephesus.