Aristarchus may refer to:
- Aristarchus of Samos (c. 310–230 BC), Greek astronomer and mathematician
- Aristarchus of Samothrace (c. 220–143 BC), Greek grammarian
- Aristarchus of Tegea (5th century BC), Greek writer
- Aristarchus of Thessalonica (1st century AD), Eastern saint and early Christian mentioned in a few passages in the New Testament
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