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|273 by topic|
|Ab urbe condita||1026|
|Balinese saka calendar||194–195|
|Chinese calendar||壬辰年 (Water Dragon)|
2969 or 2909
— to —
癸巳年 (Water Snake)
2970 or 2910
|Coptic calendar||−11 – −10|
|- Vikram Samvat||329–330|
|- Shaka Samvat||194–195|
|- Kali Yuga||3373–3374|
|Iranian calendar||349 BP – 348 BP|
|Islamic calendar||360 BH – 359 BH|
|Minguo calendar||1639 before ROC|
|Seleucid era||584/585 AG|
|Thai solar calendar||815–816|
399 or 18 or −754
— to —
400 or 19 or −753
Year 273 (CCLXXIII) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Tacitus and Placidianus (or, less frequently, year 1026 Ab urbe condita). The denomination 273 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.
- Emperor Aurelian sacks the city of Palmyra for a second time after putting down a new revolt.
- The kingdom of Palmyra is reunited with the Roman Empire.
- Aurelian refuses to wear the imperial crown and coat.
- Marcus Claudius Tacitus, future Roman Emperor, is consul in Rome.
- Tetricus I and Tetricus II are deposed as Gallic Emperors by Aurelian.
- Administrative reorganization of Italy: Aurelian adopts as permanent the reforms instituted by Caracalla.
- Aurelian increases Rome's daily bread ration to nearly 1.5 pounds and adds pig fat to the list of foods distributed free to the populace.
- Cassius Longinus, counselor of queen Zenobia, is executed by the Romans for conspiring against Aurelian.
- An Indian delegation visits Aurelian.
- King Hormizd I of Persia dies after a brief reign in which he has shown tolerance toward the ascetic, anti-materialist Manichean faith. He is succeeded by his brother Bahram I, who has been governing the province of Atropatene.
- Cassius Longinus, Greek philosopher
- Dexippus, Greek historian
- Hormizd I, king of Persia
- Wei Zhao, Chinese historian and scholar (b. 204)