Millennium:	1st millennium BC
Centuries:	2nd century BC 1st century BC 1st century
Decades:	20s BC 10s BC 0s BC 0s 10s
Years:	6 BC 5 BC 4 BC 3 BC 2 BC 1 BC AD 1

Politics
3 BC by topic
State leaders Political entities
Categories
Births
v t e

3 BC in various calendars
Gregorian calendar	3 BC III BC
Ab urbe condita	751
Ancient Greek era	194th Olympiad, year 2
Assyrian calendar	4748
Balinese saka calendar	N/A
Bengali calendar	−595
Berber calendar	948
Buddhist calendar	542
Burmese calendar	−640
Byzantine calendar	5506–5507
Chinese calendar	丁巳年 (Fire Snake) 2695 or 2488 — to — 戊午年 (Earth Horse) 2696 or 2489
Coptic calendar	−286 – −285
Discordian calendar	1164
Ethiopian calendar	−10 – −9
Hebrew calendar	3758–3759
Hindu calendars
- Vikram Samvat	54–55
- Shaka Samvat	N/A
- Kali Yuga	3098–3099
Holocene calendar	9998
Iranian calendar	624 BP – 623 BP
Islamic calendar	643 BH – 642 BH
Javanese calendar	N/A
Julian calendar	3 BC III BC
Korean calendar	2331
Minguo calendar	1914 before ROC 民前1914年
Nanakshahi calendar	−1470
Seleucid era	309/310 AG
Thai solar calendar	540–541
Tibetan calendar	阴火蛇年 (female Fire-Snake) 124 or −257 or −1029 — to — 阳土马年 (male Earth-Horse) 125 or −256 or −1028

Year 3 BC was a common year starting on Wednesday or Thursday (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 Tuesday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Lentulus and Messalla (or, less frequently, year 751 Ab urbe condita). The denomination 3 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

King Maroboduus of the Marcomanni organises, in the area later known as Bohemia, a confederation of Germanic tribes, with the Hermunduri, Lombards, Semnoni and Vandals.^{[citation needed]}
Lucius Domitius Ahenobarbus commands the Roman army in Germania and crosses the Elbe. He builds the pontes longi (“long bridges”) over the marshes between the Rhine and the Ems.^{[citation needed]}

Births