|Millennium:||1st millennium BC|
|297 BC by topic|
|Gregorian calendar||297 BC|
|Ab urbe condita||457|
|Ancient Egypt era||XXXIII dynasty, 27|
|- Pharaoh||Ptolemy I Soter, 27|
|Ancient Greek era||120th Olympiad, year 4|
|Balinese saka calendar||N/A|
|Chinese calendar||癸亥年 (Water Pig)|
2400 or 2340
— to —
甲子年 (Wood Rat)
2401 or 2341
|Coptic calendar||−580 – −579|
|Ethiopian calendar||−304 – −303|
|- Vikram Samvat||−240 – −239|
|- Shaka Samvat||N/A|
|- Kali Yuga||2804–2805|
|Iranian calendar||918 BP – 917 BP|
|Islamic calendar||946 BH – 945 BH|
|Minguo calendar||2208 before ROC|
|Seleucid era||15/16 AG|
|Thai solar calendar||246–247|
−170 or −551 or −1323
— to —
−169 or −550 or −1322
Year 297 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Rullianus and Mus (or, less frequently, year 457 Ab urbe condita). The denomination 297 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.
- Fabius Maximus Rullianus becomes consul for the fourth time. He defeats the Samnites in a battle near Tifernum.
- Following Cassander's death from illness, Philip IV, Cassander's eldest son, succeeds his father as King of Macedon, but soon after coming to the throne suffers from a wasting disease and dies. Antipater, the next son, rules jointly with his brother Alexander V.
- Demetrius Poliorcetes returns to Greece with the aim of becoming master of Macedonia. While Demetrius is in Greece, Lysimachus seizes his possessions in Asia Minor.
- Ptolemy decides to support Pyrrhus of Epirus and restores him to his kingdom. At first Pyrrhus reigns with a kinsman, Neoptolemus II of Epirus (who is a son of Cleopatra of Macedonia and a nephew of Alexander the Great), but soon he has him assassinated.
- Chandragupta Maurya goes to Sravana Belagola near Mysore to live in the way of Jains.
- Bindusara his son ascends to the Pataliputra throne.
- King Cassander of Macedon (one of the diadochoi ("successors"), the Macedonian generals who have fought over the empire of Alexander the Great after his death) (b. c. 358 BC)