18 BC

18 BC in various calendars
Gregorian calendar	18 BC; XVIII BC
Ab urbe condita	736
Ancient Greek Olympiad (summer)	190th Olympiad, year 3
Assyrian calendar	4733
Balinese saka calendar	N/A
Bengali calendar	−611 – −610
Berber calendar	933
Buddhist calendar	527
Burmese calendar	−655
Byzantine calendar	5491–5492
Chinese calendar	壬寅年 (Water Tiger); 2680 or 2473; — to —; 癸卯年 (Water Rabbit); 2681 or 2474
Coptic calendar	−301 – −300
Discordian calendar	1149
Ethiopian calendar	−25 – −24
Hebrew calendar	3743–3744
Hindu calendars
- Vikram Samvat	39–40
- Shaka Samvat	N/A
- Kali Yuga	3083–3084
Holocene calendar	9983
Iranian calendar	639 BP – 638 BP
Islamic calendar	659 BH – 658 BH
Javanese calendar	N/A
Julian calendar	18 BC; XVIII BC
Korean calendar	2316
Minguo calendar	1929 before ROC; 民前1929年
Nanakshahi calendar	−1485
Seleucid era	294/295 AG
Thai solar calendar	525–526
Tibetan calendar	ཆུ་ཕོ་སྟག་ལོ་; (male Water-Tiger); 109 or −272 or −1044; — to —; ཆུ་མོ་ཡོས་ལོ་; (female Water-Hare); 110 or −271 or −1043

Year 18 BC was either a common year starting on Friday, Saturday or Sunday or a leap year starting on Saturday of the Julian calendar (the sources differ, see leap year error for further information) and a common year starting on Thursday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Lentulus and Lentulus (or, less frequently, year 736 Ab urbe condita). The denomination 18 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.

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