|Millennium:||1st millennium BC|
|235 BC by topic|
|Gregorian calendar||235 BC|
|Ab urbe condita||519|
|Ancient Egypt era||XXXIII dynasty, 89|
|- Pharaoh||Ptolemy III Euergetes, 12|
|Ancient Greek era||136th Olympiad, year 2|
|Balinese saka calendar||N/A|
|Chinese calendar||乙丑年 (Wood Ox)|
2462 or 2402
— to —
丙寅年 (Fire Tiger)
2463 or 2403
|Coptic calendar||−518 – −517|
|Ethiopian calendar||−242 – −241|
|- Vikram Samvat||−178 – −177|
|- Shaka Samvat||N/A|
|- Kali Yuga||2866–2867|
|Iranian calendar||856 BP – 855 BP|
|Islamic calendar||882 BH – 881 BH|
|Minguo calendar||2146 before ROC|
|Seleucid era||77/78 AG|
|Thai solar calendar||308–309|
−108 or −489 or −1261
— to —
−107 or −488 or −1260
Year 235 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Torquatus and Bulbus (or, less frequently, year 519 Ab urbe condita). The denomination 235 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.
- In Rome, the consul Titus Manlius Torquatus presides over the first ever closing of the gates of the Temple of Janus, signifying peace.
- Under King Attalus I, Pergamum begins to build up its power and importance.
- Antiochus Hierax defeats his brother King Seleucus II Callinicus at the Battle of Ancyra.
- Aratus of Sicyon brings Megalopolis into the Achaean League.
- The ephor, Lysander, claims to have seen a sign from the gods against King Leonidas II of Sparta so Leonidas flees to avoid his trial. In his absence, Leonidas is deposed from the throne and replaced by his son-in-law, Cleomenes III.