Eustathius of Thessalonica was a Byzantine Greek scholar and Archbishop of Thessalonica and is a saint in the Eastern Orthodox Church. He is most noted for his stand against the sack of Thessalonica by the Normans in 1185, contemporary account of the event, for his orations and for his commentaries on Homer, which incorporate many remarks by much earlier researchers.

The Metropolis of Thessaloniki is a Greek Orthodox metropolitan see based in the city of Thessaloniki in Central Macedonia, Greece. It is part of the so-called "New Lands", belonging to the jurisdiction of the Ecumenical Patriarchate of Constantinople but being administered by the Church of Greece. The see traces its history to its foundation by the Apostle Paul in the 1st century. Since 2023, the incumbent metropolitan is Filotheos Theocharis.