Omonia (Greek: Ομόνοια, Omonoia) is an underground station under the Omonoia square of Athens, used by Athens Metro Lines 1 and 2.

The first station opened 1895, but was relocated underground and redesigned by the Hellenic Electric Railways (which operated Line 1 at the time) in 1930.

In January 2000 the additional platforms for Line 2 were opened.

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