| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 904 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 904 CMIV |
| Ab urbe condita | 1657 |
| Armenian calendar | 353 ԹՎ ՅԾԳ |
| Assyrian calendar | 5654 |
| Balinese saka calendar | 825–826 |
| Bengali calendar | 311 |
| Berber calendar | 1854 |
| Buddhist calendar | 1448 |
| Burmese calendar | 266 |
| Byzantine calendar | 6412–6413 |
| Chinese calendar | 癸亥年 (Water Pig) 3601 or 3394 — to — 甲子年 (Wood Rat) 3602 or 3395 |
| Coptic calendar | 620–621 |
| Discordian calendar | 2070 |
| Ethiopian calendar | 896–897 |
| Hebrew calendar | 4664–4665 |
| Hindu calendars | |
| - Vikram Samvat | 960–961 |
| - Shaka Samvat | 825–826 |
| - Kali Yuga | 4004–4005 |
| Holocene calendar | 10904 |
| Iranian calendar | 282–283 |
| Islamic calendar | 291–292 |
| Japanese calendar | Engi 4 (延喜４年) |
| Javanese calendar | 803–804 |
| Julian calendar | 904 CMIV |
| Korean calendar | 3237 |
| Minguo calendar | 1008 before ROC 民前1008年 |
| Nanakshahi calendar | −564 |
| Seleucid era | 1215/1216 AG |
| Thai solar calendar | 1446–1447 |
| Tibetan calendar | 阴水猪年 (female Water-Pig) 1030 or 649 or −123 — to — 阳木鼠年 (male Wood-Rat) 1031 or 650 or −122 |
Year 904 (CMIV) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar.