| Millennium: | 1st millennium BC |
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| Centuries: |
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| Decades: |
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| Years: |
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| 4 BC by topic |
| Politics |
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| Categories |
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| Gregorian calendar | 4 BC IV BC |
| Ab urbe condita | 750 |
| Ancient Greek era | 194th Olympiad (victor)¹ |
| Assyrian calendar | 4747 |
| Balinese saka calendar | N/A |
| Bengali calendar | −596 |
| Berber calendar | 947 |
| Buddhist calendar | 541 |
| Burmese calendar | −641 |
| Byzantine calendar | 5505–5506 |
| Chinese calendar | 丙辰年 (Fire Dragon) 2694 or 2487 — to — 丁巳年 (Fire Snake) 2695 or 2488 |
| Coptic calendar | −287 – −286 |
| Discordian calendar | 1163 |
| Ethiopian calendar | −11 – −10 |
| Hebrew calendar | 3757–3758 |
| Hindu calendars | |
| - Vikram Samvat | 53–54 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3097–3098 |
| Holocene calendar | 9997 |
| Iranian calendar | 625 BP – 624 BP |
| Islamic calendar | 644 BH – 643 BH |
| Javanese calendar | N/A |
| Julian calendar | 4 BC IV BC |
| Korean calendar | 2330 |
| Minguo calendar | 1915 before ROC 民前1915年 |
| Nanakshahi calendar | −1471 |
| Seleucid era | 308/309 AG |
| Thai solar calendar | 539–540 |
| Tibetan calendar | 阳火龙年 (male Fire-Dragon) 123 or −258 or −1030 — to — 阴火蛇年 (female Fire-Snake) 124 or −257 or −1029 |
Year 4 BC was a common year starting on TuesdayorWednesday (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 Monday of the Proleptic Julian calendar. At the time, it was known as the Year of the Consulship of Sabinus and Rufus (or, less frequently, year 750 Ab urbe condita). The denomination 4 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.
