21 BC
Year 21 BC was either a common year starting on Monday, Tuesday or Wednesday or a leap year starting on Tuesday of the Julian calendar. At the time, it was known as the Year of the Consulship of Lollius and Lepidus.
| 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 | 
| Gregorian calendar | 21 BC XX BC | 
| Ab urbe condita | 733 | 
| Ancient Greek era | 189th Olympiad, year 4 | 
| Assyrian calendar | 4730 | 
| Balinese saka calendar | N/A | 
| Bengali calendar | −613 | 
| Berber calendar | 930 | 
| Buddhist calendar | 524 | 
| Burmese calendar | −658 | 
| Byzantine calendar | 5488–5489 | 
| Chinese calendar | 己亥年 (Earth Pig) 2676 or 2616 — to — 庚子年 (Metal Rat) 2677 or 2617 | 
| Coptic calendar | −304 – −303 | 
| Discordian calendar | 1146 | 
| Ethiopian calendar | −28 – −27 | 
| Hebrew calendar | 3740–3741 | 
| Hindu calendars | |
| - Vikram Samvat | 36–37 | 
| - Shaka Samvat | N/A | 
| - Kali Yuga | 3080–3081 | 
| Holocene calendar | 9980 | 
| Iranian calendar | 642 BP – 641 BP | 
| Islamic calendar | 662 BH – 661 BH | 
| Javanese calendar | N/A | 
| Julian calendar | 21 BC XX BC | 
| Korean calendar | 2313 | 
| Minguo calendar | 1932 before ROC 民前1932年 | 
| Nanakshahi calendar | −1488 | 
| Seleucid era | 291/292 AG | 
| Thai solar calendar | 522–523 | 
| Tibetan calendar | 阴土猪年 (female Earth-Pig) 106 or −275 or −1047 — to — 阳金鼠年 (male Iron-Rat) 107 or −274 or −1046 | 
Events
    
- Marcus Vipsanius Agrippa divorces Claudia Marcella. He then marries Julia the Elder, daughter of Caesar Augustus.
Births
    
- Naevius Sutorius Macro, Roman politician (d. AD 38)
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