18 BC

Millennium:	1st millennium BC
Centuries:	2nd century BC – 1st century BC – 1st century
Decades:	40s BC  30s BC  20s BC  – 10s BC –  0s BC  0s  10s
Years:	21 BC 20 BC 19 BC – 18 BC – 17 BC 16 BC 15 BC

18 BC in other calendars

Gregorian calendar	18 BC XVII BC
Ab urbe condita	736
Ancient Greek era	190th Olympiad, year 3
Assyrian calendar	4733
Bengali calendar	−610
Berber calendar	933
Buddhist calendar	527
Burmese calendar	−655
Byzantine calendar	5491–5492
Chinese calendar	壬寅年 (Water Tiger) 2679 or 2619     — to — 癸卯年 (Water Rabbit) 2680 or 2620
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	3084–3085
Holocene calendar	9983
Iranian calendar	639 BP – 638 BP
Islamic calendar	659 BH – 658 BH
Julian calendar	18 BC XVII BC
Korean calendar	2316
Minguo calendar	1929 before ROC 民前1929年
Seleucid era	294/295 AG
Thai solar calendar	525–526

Year 18 BC was either a common year starting on Friday, Saturday or Sunday or a leap year starting on Saturday (link will display the full calendar) 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.

Events

By place

Roman empire

• Caesar Augustus introduce the Lex Julia (Julian Laws):
  • Lex Iulia de Ambitu: Penalising bribery when acquiring political offices.
  • Lex Iulia de Maritandis Ordinibus: Limiting marriage across social class boundaries.

Asia

• Onjo becomes the first ruler of the Korean kingdom of Baekje (traditional date).