|Millennium:||1st millennium BC|
|4 BC by topic|
|Gregorian calendar||4 BC
|Ab urbe condita||750|
|Ancient Greek era||194th Olympiad (victor)¹|
|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|
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.
Judea Province, Roman Empire
- After the death of Herod the Great, there is unrest in his kingdom. His son, Herod Archelaus becomes the new ruler of Judea. 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 marched down to Jerusalem from Antioch to restore order. He crucifies 2,000 Jewish rebels.
- Jesus: Due to 4 BC being the year of King Herod's death, it is usually cited by modern Biblical scholars as being the last possible birth year of Jesus (d. circa AD 30).
- Seneca the Younger (c. 4 BC – AD 65), a Roman Stoic philosopher, statesman, and dramatist