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Magnesia (hypothetical city), a future colony of Knossos, imagined in Plato's
Laws •
Magnesia (regional unit), the southeastern area of Thessaly in central Greece •
Magnesia (constituency), electoral district •
Ancient Magnesia, a historical region of Greece with borders differing from the modern regional unit •
Magnesia ad Sipylum, a city of Lydia, now Manisa in Turkey •
Battle of Magnesia, 190 BC, the concluding battle of the Roman–Seleucid War •
Magnesia on the Maeander, an ancient Greek city in Anatolia •
Magnesia Prefecture, a former prefecture of Greece