| 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: | 7 BC 6 BC 5 BC – 4 BC – 3 BC 2 BC 1 BC |
| 4 BC by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishments and disestablishments categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 4 BC |
| Ab urbe condita | 750 |
| Armenian calendar | N/A |
| Assyrian calendar | 4747 |
| Bahá'í calendar | -1847–-1846 |
| Bengali calendar | -596 |
| Berber calendar | 947 |
| English Regnal year | N/A |
| Buddhist calendar | 541 |
| Burmese calendar | -641 |
| Byzantine calendar | 5505–5506 |
| Chinese calendar | 丙辰年 (2633/2693) — to —
丁巳年(2634/2694) |
| Coptic calendar | -287–-286 |
| Ethiopian calendar | -11–-10 |
| Hebrew calendar | 3757–3758 |
| Hindu calendars | |
| - Vikram Samvat | 53–54 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3098–3099 |
| Holocene calendar | 9997 |
| Iranian calendar | 625 BP – 624 BP |
| Islamic calendar | 644 BH – 643 BH |
| Japanese calendar | |
| Korean calendar | 2330 |
| Minguo calendar | 1915 before ROC 民前1915年 |
| Thai solar calendar | 540 |
Year 4 BC was a common year starting on Tuesday or Wednesday (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.