| Millennium: | 1st millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 604 by topic |
|---|
| Leaders |
| Categories |
| Gregorian calendar | 604 DCIV |
| Ab urbe condita | 1357 |
| Armenian calendar | 53 ԹՎ ԾԳ |
| Assyrian calendar | 5354 |
| Balinese saka calendar | 525–526 |
| Bengali calendar | 11 |
| Berber calendar | 1554 |
| Buddhist calendar | 1148 |
| Burmese calendar | −34 |
| Byzantine calendar | 6112–6113 |
| Chinese calendar | 癸亥年 (Water Pig) 3301 or 3094 — to — 甲子年 (Wood Rat) 3302 or 3095 |
| Coptic calendar | 320–321 |
| Discordian calendar | 1770 |
| Ethiopian calendar | 596–597 |
| Hebrew calendar | 4364–4365 |
| Hindu calendars | |
| - Vikram Samvat | 660–661 |
| - Shaka Samvat | 525–526 |
| - Kali Yuga | 3704–3705 |
| Holocene calendar | 10604 |
| Iranian calendar | 18 BP – 17 BP |
| Islamic calendar | 19 BH – 18 BH |
| Japanese calendar | N/A |
| Javanese calendar | 493–494 |
| Julian calendar | 604 DCIV |
| Korean calendar | 2937 |
| Minguo calendar | 1308 before ROC 民前1308年 |
| Nanakshahi calendar | −864 |
| Seleucid era | 915/916 AG |
| Thai solar calendar | 1146–1147 |
| Tibetan calendar | 阴水猪年 (female Water-Pig) 730 or 349 or −423 — to — 阳木鼠年 (male Wood-Rat) 731 or 350 or −422 |
Year 604 (DCIV) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar. The denomination 604 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.