| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| AD 4 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | AD 4 IV |
| Ab urbe condita | 757 |
| Assyrian calendar | 4754 |
| Balinese saka calendar | N/A |
| Bengali calendar | −589 |
| Berber calendar | 954 |
| Buddhist calendar | 548 |
| Burmese calendar | −634 |
| Byzantine calendar | 5512–5513 |
| Chinese calendar | 癸亥年 (Water Pig) 2701 or 2494 — to — 甲子年 (Wood Rat) 2702 or 2495 |
| Coptic calendar | −280 – −279 |
| Discordian calendar | 1170 |
| Ethiopian calendar | −4 – −3 |
| Hebrew calendar | 3764–3765 |
| Hindu calendars | |
| - Vikram Samvat | 60–61 |
| - Shaka Samvat | N/A |
| - Kali Yuga | 3104–3105 |
| Holocene calendar | 10004 |
| Iranian calendar | 618 BP – 617 BP |
| Islamic calendar | 637 BH – 636 BH |
| Javanese calendar | N/A |
| Julian calendar | AD 4 IV |
| Korean calendar | 2337 |
| Minguo calendar | 1908 before ROC 民前1908年 |
| Nanakshahi calendar | −1464 |
| Seleucid era | 315/316 AG |
| Thai solar calendar | 546–547 |
| Tibetan calendar | 阴水猪年 (female Water-Pig) 130 or −251 or −1023 — to — 阳木鼠年 (male Wood-Rat) 131 or −250 or −1022 |
AD 4 was a common year starting on Wednesday or a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar (sources differ, see leap year error for further information) and a leap year starting on Tuesday of the Proleptic Julian calendar. In the Roman Empire, it was known as the Year of the Consulship of Catus and Saturninus (or, less frequently, year 757 Ab urbe condita). The denomination "AD 4" 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.