|Millennium:||1st millennium BC|
|4 BC by topic|
|Gregorian calendar||4 BC|
|Ab urbe condita||750|
|Ancient Greek era||194th Olympiad (victor)¹|
|Balinese saka calendar||N/A|
|Chinese calendar||丙辰年 (Fire Dragon)|
2693 or 2633
— to —
丁巳年 (Fire Snake)
2694 or 2634
|Coptic calendar||−287 – −286|
|Ethiopian calendar||−11 – −10|
|- Vikram Samvat||53–54|
|- Shaka Samvat||N/A|
|- Kali Yuga||3097–3098|
|Iranian calendar||625 BP – 624 BP|
|Islamic calendar||644 BH – 643 BH|
|Julian calendar||4 BC|
|Minguo calendar||1915 before ROC|
|Seleucid era||308/309 AG|
|Thai solar calendar||539–540|
123 or −258 or −1030
— to —
124 or −257 or −1029
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.
- c. March – Upon the death of Herod the Great, there is unrest in his client kingdom of Judea. His son, Herod Archelaus, becomes the new ruler. Herod Antipas becomes tetrarch of Galilee and Perea. The Governor of Syria, Publius Quintilius Varus, assembles three of his four legions, including Legio X Fretensis, and marches down to Jerusalem from Antioch to restore order. He crucifies 2,000 Jewish rebels.
- c. October – The Naikū of Ise Grand Shrine is founded in Japan, according to chapter 6 of Nihon Shoki.
- Namhae becomes king of the Korean kingdom of Silla.
- c. Possible months being June or October (due to convergence of Jupiter and Saturn forming the star of Bethlehem at his birth) – Jesus, Son of God who becomes the central figure of messianic Israelites and Christianity (d. AD 30 or AD 33).
- Approximate date – Seneca the Younger, Córdoban-born Roman Stoic philosopher, statesman and dramatist (d. AD 65)
- March or April – Herod the Great, king of Judea (b. 73 BC)
- Antipater, Jewish heir and son of Herod the Great
- Malthace, Jewish woman and wife of Herod the Great
- Marcus Porcius Latro, Roman rhetorician
- Marcus Tullius Tiro, Roman writer, freedman of Cicero
- ^ "List of Rulers of Korea". www.metmuseum.org. Retrieved April 21, 2019.
- ^ "Herod | Biography & Facts". Encyclopedia Britannica. Retrieved April 7, 2019.