| Millennium: | 1st millennium BC |
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| Centuries: |
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| Decades: |
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| Years: |
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| 3 BC by topic |
| Politics |
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| Categories |
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| 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 WednesdayorThursday (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.
