Polybius (c. 203 BC – 120 BC) was an ancient Greek historian.
Polybius may also refer to:
People
- Polybius (freedman) (fl. 1st century), freedman and later secretariat under the Roman Emperor Claudius
- Polybius of Tralles, a 2nd-century Christian bishop mentioned in the writings of Ignatius of Antioch
Other uses
- Polybius (crab), a genus of swimming crabs
- Polybius (crater), a lunar impact crater
- Polybius (urban legend), a fictitious video game featured in urban legend
- Polybius (2017 video game), released for the PlayStation 4
- Polybius square, a cipher key technique
- "Polybius", the fourth episode of Dimension 404, based on the urban legend
- Polybius Bank, an Estonian bank
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