Achaeans are the inhabitants of Achaea in Greece. However, the meaning of Achaea changed during the course of Ancient history, and thus Achaeans may refer to:
- Achaeans (Homer), a name used by Homer in the Iliad for Mycenaean-era Greeks in general
- Achaeans (tribe), one of the major tribes of Greece according to the Hesiodic foundation myth
- Achaea (ancient region), historical inhabitants, during the Archaic and Classical periods, of the Peloponnesian region of Achaea
- Achaea Phthiotis, a region of ancient Thessaly
- Achaean League
- Achaea, the modern Greek administrative unit
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