21 BC

Millennium:	1st millennium BC
Centuries:	2nd century BC – 1st century BC – 1st century
Decades:	50s BC  40s BC  30s BC  – 20s BC –  10s BC  0s BC  0s
Years:	24 BC 23 BC 22 BC – 21 BC – 20 BC 19 BC 18 BC

21 BC by topic

Politics

State leaders – Sovereign states

Birth and death categories

Births – Deaths

Establishments and disestablishments categories

Establishments – Disestablishments

21 BC in other calendars

Gregorian calendar	21 BC
Ab urbe condita	733
Armenian calendar	N/A
Assyrian calendar	4730
Bahá'í calendar	-1864–-1863
Bengali calendar	-613
Berber calendar	930
English Regnal year	N/A
Buddhist calendar	524
Burmese calendar	-658
Byzantine calendar	5488–5489
Chinese calendar	己亥年 (2616/2676) — to — 庚子年 (2617/2677)
Coptic calendar	-304–-303
Ethiopian calendar	-28–-27
Hebrew calendar	3740–3741
Hindu calendars
- Vikram Samvat	36–37
- Shaka Samvat	N/A
- Kali Yuga	3081–3082
Holocene calendar	9980
Iranian calendar	642 BP – 641 BP
Islamic calendar	662 BH – 661 BH
Japanese calendar
Korean calendar	2313
Minguo calendar	1932 before ROC 民前1932年
Thai solar calendar	523

Year 21 BC was either a common year starting on Monday, Tuesday or Wednesday or a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar (the sources differ, see leap year error for further information) and a leap year starting on Sunday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Lollius and Lepidus (or, less frequently, year 733 Ab urbe condita). The denomination 21 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

• Marcus Vipsanius Agrippa divorces Claudia Marcella, and marries Julia the Elder, daughter of Caesar Augustus.

Births

• Naevius Sutorius Macro, Roman prefect and politician (d. AD 38)