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218 in various calendars
Gregorian calendar	218; CCXVIII
Ab urbe condita	971
Assyrian calendar	4968
Balinese saka calendar	139–140
Bengali calendar	−376 – −375
Berber calendar	1168
Buddhist calendar	762
Burmese calendar	−420
Byzantine calendar	5726–5727
Chinese calendar	丁酉年 (Fire Rooster); 2915 or 2708; — to —; 戊戌年 (Earth Dog); 2916 or 2709
Coptic calendar	−66 – −65
Discordian calendar	1384
Ethiopian calendar	210–211
Hebrew calendar	3978–3979
Hindu calendars
- Vikram Samvat	274–275
- Shaka Samvat	139–140
- Kali Yuga	3318–3319
Holocene calendar	10218
Iranian calendar	404 BP – 403 BP
Islamic calendar	416 BH – 415 BH
Javanese calendar	95–96
Julian calendar	218; CCXVIII
Korean calendar	2551
Minguo calendar	1694 before ROC; 民前1694年
Nanakshahi calendar	−1250
Seleucid era	529/530 AG
Thai solar calendar	760–761
Tibetan calendar	阴火鸡年; (female Fire-Rooster); 344 or −37 or −809; — to —; 阳土狗年; (male Earth-Dog); 345 or −36 or −808

Millennium:	1st millennium
Centuries:	2nd century; 3rd century ; 4th century;
Decades:	190s; 200s; 210s ; 220s; 230s;
Years:	215; 216; 217; 218 ; 219; 220; 221;

Year 218 (CCXVIII) was a common year starting on Thursday of the Julian calendar. At the time, it was known as the Year of the Consulship of Severus and Adventus (or, less frequently, year 971 Ab urbe condita). The denomination 218 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.

Events

May 16 – Julia Maesa, an aunt of the assassinated Emperor Caracalla, is banished to her home in Syria by the self-proclaimed emperor Macrinus, and declares her grandson Elagabalus, age 14, emperor of Rome.
June 8 – Battle of Antioch: Elagabalus defeats, with the support of the Syrian legions, the forces of Macrinus. Macrinus flees, but is captured near Chalcedon and later executed in Cappadocia.
Diadumenianus, son of Macrinus, escapes to the Parthian court, but is captured at Zeugma and also put to death.

Spring – Ji Ben (or Ji Ping), Chinese court physician, plots a rebellion in the imperial capital Xu (modern-day Xuchang), but the revolt is suppressed and the conspirators are captured and executed.

The silver content of the Roman denarius falls to 43 percent under the reign of Elagabalus, down from 50 percent under Septimius Severus, as he empties the treasury.