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|Millennium:||1st millennium BC|
|357 BC by topic|
|Gregorian calendar||357 BC|
|Ab urbe condita||397|
|Ancient Egypt era||XXX dynasty, 24|
|- Pharaoh||Nectanebo II, 4|
|Ancient Greek era||105th Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||癸亥年 (Water Pig)|
2340 or 2280
— to —
甲子年 (Wood Rat)
2341 or 2281
|Coptic calendar||−640 – −639|
|Ethiopian calendar||−364 – −363|
|- Vikram Samvat||−300 – −299|
|- Shaka Samvat||N/A|
|- Kali Yuga||2744–2745|
|Iranian calendar||978 BP – 977 BP|
|Islamic calendar||1008 BH – 1007 BH|
|Minguo calendar||2268 before ROC|
|Thai solar calendar||186–187|
−230 or −611 or −1383
— to —
−229 or −610 or −1382
Year 357 BC was a year of the pre-Julian Roman calendar. At the time, it was known as the Year of the Consulship of Rutilus and Imperiosus (or, less frequently, year 397 Ab urbe condita). The denomination 357 BC for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years.
- The Athenian general and mercenary commander, Chares and the Euboean mercenary Charidemus regain the Thracian Chersonese for Athens from the Thracian king Cersobleptes. Charidemus receives, from Athens, a golden crown for his part in the victory.
- The Macedonian general, Parmenion, wins a great victory over the Illyrians. King Philip II of Macedon, having disposed of an Illyrian threat, occupies the Athenian city of Amphipolis (which commands the gold mines of Mount Pangaion). Philip II now has control of the strategic city which secures the eastern frontier of Macedonia and gives him access into Thrace.
- Philip II of Macedon marries Olympias, the Molossian princess of Epirus thus helping to stabilize Macedonia's western frontier.
- The brother-in-law of Dionysius I, Dion, exiled from Syracuse in 366 BC by Dionysius II, assembles a force of 1,500 mercenaries at Zacynthus and sails to Sicily. Dion wrests power from the weak Dionysius II, who is exiled and flees to Locri.
- Chabrias, Athenian general