Greektown is a general name for an ethnic enclave populated primarily by Greeks or people of Greek ancestry, usually in an urban neighborhood.
The Holy Trinity Greek Orthodox Greek Church in the Greek quarter in Vienna, late 19th century
The oldest Greek dominated neighborhood outside of Greece were probably the Fener in Istanbul, or the Ash Shatibi in Alexandria.
In Vienna, for many centuries, the Griechenviertel (Greek quarter) existed in the Innere Stadt (inner town). Later the Greek community moved to other newer quarters. A traditional Austrian restaurant there is called Griechenbeisl (Greek tavern) and a street Griechengasse (Greek lane).