| Millennium: | 1st millennium BC |
|---|---|
| Centuries: | 2nd century BC – 1st century BC – 1st century |
| Decades: | 30s BC 20s BC 10s BC – 0s BC – 0s 10s 20s |
| Years: | 6 BC 5 BC 4 BC – 3 BC – 2 BC 1 BC 1 AD |
| 3 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 3 BC |
| Ab urbe condita | 751 |
| Armenian calendar | N/A |
| Bahá'í calendar | -1846 – -1845 |
| Bengali calendar | -595 |
| Berber calendar | 948 |
| Buddhist calendar | 542 |
| Burmese calendar | -640 |
| Byzantine calendar | 5506 – 5507 |
| Chinese calendar | 丁巳年 (2634/2694) — to —
戊午年(2635/2695) |
| Coptic calendar | -286 – -285 |
| Ethiopian calendar | -10 – -9 |
| Hebrew calendar | 3758 – 3759 |
| Hindu calendars | |
| - Bikram Samwat | 54 – 55 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3099 – 3100 |
| Holocene calendar | 9998 |
| Iranian calendar | 624 BP – 623 BP |
| Islamic calendar | 643 BH – 642 BH |
| Japanese calendar | |
| Korean calendar | 2331 |
| Thai solar calendar | 541 |
Year 3 BC was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.