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|Ab urbe condita||1046|
|Balinese saka calendar||214–215|
|Chinese calendar||壬子年 (Water Rat)|
2989 or 2929
— to —
癸丑年 (Water Ox)
2990 or 2930
|- Vikram Samvat||349–350|
|- Shaka Samvat||214–215|
|- Kali Yuga||3393–3394|
|Iranian calendar||329 BP – 328 BP|
|Islamic calendar||339 BH – 338 BH|
|Minguo calendar||1619 before ROC|
|Seleucid era||604/605 AG|
|Thai solar calendar||835–836|
419 or 38 or −734
— to —
420 or 39 or −733
Year 293 (CCXCIII) was a common year starting on Sunday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Valerius and Valerius (or, less frequently, year 1046 Ab urbe condita). The denomination 293 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.
- March 1 – Emperors Diocletian and Maximian appoint Constantius Chlorus and Galerius as Caesars. This is considered the beginning of the Tetrarchy, known as the Quattuor Principes Mundi ("Four Rulers of the World").
- The four Tetrarchs establish their capitals close to the Roman frontier:
- Diocletian's Palace is built at a small bay on the Dalmatian coast, four miles from Salona (today's Split, Croatia).
- Constantius Chlorus retakes some of the Gallic territories, and conquers the crucial port of Bononia (modern Boulogne).
- Carausius, Roman usurper, is murdered by his finance minister Allectus, who proclaims himself "emperor" of Britain.
- Constantius Chlorus defeats the Franks on the Rhine frontier, in Batavia (Netherlands).
- King Bahram II of the Persian Empire dies after a 17-year reign; his son Bahram III ascends to the throne. After four months, he is murdered by viceroy Narseh, with support of the nobility.
- Narseh becomes king of Persia, and engages Rome in eight years of constant warfare.
- Probus succeeds Rufinus, as Patriarch of Constantinople.
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- Bahram II, king of Persia
- Bahram III, king of Persia
- Carausius, Roman usurper of northern Gaul and Britain
- Tuoba Chuo, chieftain of the Chinese Tuoba tribe
- Spencer C. Tucker (December 23, 2009). A Global Chronology of Conflict: From the Ancient World to the Modern Middle East: From the Ancient World to the Modern Middle East. ABC-CLIO. p. 153. ISBN 978-1-85109-672-5.