|Millennium:||1st millennium BC|
|Centuries:||4th century BC – 3rd century BC – 2nd century BC|
|Decades:||310s BC 300s BC 290s BC – 280s BC – 270s BC 260s BC 250s BC|
|Years:||285 BC 284 BC 283 BC – 282 BC – 281 BC 280 BC 279 BC|
|282 BC by topic|
|Gregorian calendar||282 BC|
|Ab urbe condita||472|
|Bahá'í calendar||−2125 – −2124|
|English Regnal year||N/A|
|Chinese calendar||戊寅年 (Earth Tiger)
2415 or 2355
— to —
己卯年 (Earth Rabbit)
2416 or 2356
|Coptic calendar||−565 – −564|
|Ethiopian calendar||−289 – −288|
|- Vikram Samvat||−225 – −224|
|- Shaka Samvat||N/A|
|- Kali Yuga||2820–2821|
|Igbo calendar||−1281 – −1280|
|Iranian calendar||903 BP – 902 BP|
|Islamic calendar||931 BH – 930 BH|
|Minguo calendar||2193 before ROC
|Thai solar calendar||262|
|Wikimedia Commons has media related to 282 BC.|
Year 282 BC was a year of the pre-Julian Roman calendar. At the time it was known as the Year of the Consulship of Luscinus and Papus (or, less frequently, year 472 Ab urbe condita). The denomination 282 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 city of Pergamum in Asia Minor ends its allegiance to Lysimachus. Its ruler, Philetaerus, transfers his allegiance, as well as the important fortress of Pergamon and his treasury, to Seleucus, who allows him a far larger measure of independence than he had hitherto enjoyed.
- The Battle of Populonia is fought between Rome and the Etruscans. The Romans are victorious and, as a result, the Etruscan threat to Rome is sharply diminished.
- The Magna Graecia city of Thurii appeals to Rome for help against the native Italian tribes. Though the Roman Senate hesitates, the plebeian Assembly decides to respond. Thurii is saved, but Tarentum, jealous of Rome's interference, attacks and sinks some Roman ships entering its harbour. Roman envoys, sent to protest, are mistreated.
- Rome declares war on Tarentum. King Pyrrhus of Epirus declares his willingness to come to the aid of Tarentum. Tarentum also looks for support from the Samnites and other Italian tribes in southern Italy.
- Arsinoe, daughter of Lysimachus, king of Thrace, marries Ptolemy II of Egypt as part of the alliance between Thrace and Egypt against Seleucus.