Not to be confused with Achaean Greek , an alternative name for the Mycenaean Greek language and civilization. (see Achaeans)

Achaean Doric Greek may refer to:

Doric or Dorian (Δωρικὴ διάλεκτος) was a dialect of ancient Greek. Its variants were spoken in the southern and eastern Peloponnese, Crete, Rhodes, some islands in the southern Aegean Sea, some cities on the coasts of Asia Minor, Southern Italy, Sicily, Epirus and Macedon. Together with Northwest Greek, it forms the "Western group" of classical Greek dialects. By Hellenistic times, under the Achaean League, the Achaean Doric Koine appeared exhibiting many peculiarities common to all Doric dialects and which delayed the spread of the Attic-based Koine to the Peloponnese until the 2nd century BC.

It is widely accepted that Doric originated in the mountains of Epirus and Macedonia, northwestern Greece, the original seat of the Dorians. It was expanded to all other regions during the Dorian invasion (c. 1150 BC) and the colonisations that followed. The presence of a Doric state (Doris) in central Greece, north of the Gulf of Corinth, led to the theory that Doric had originated in northwest Greece or maybe beyond in the Balkans. The dialect's distribution towards the north extends to the Megarian colony of Byzantium and the Corinthian colonies of Potidaea, Epidamnos, Apollonia and Ambracia. Local epigraphical evidence is restricted to the decrees of the Epirote League and the Pella curse tablet (both in early 4th century BC), as well to the Doric eponym Machatas first attested in Macedonia (early 5th century BC).