| Millennium: | 2nd millennium |
|---|---|
| Centuries: | |
| Decades: | |
| Years: |
| 1604 by topic |
|---|
| Arts and science |
| Leaders |
| Birth and death categories |
| Births – Deaths |
| Establishments and disestablishments categories |
| Establishments – Disestablishments |
| Works category |
| Gregorian calendar | 1604 MDCIV |
| Ab urbe condita | 2357 |
| Armenian calendar | 1053 ԹՎ ՌԾԳ |
| Assyrian calendar | 6354 |
| Balinese saka calendar | 1525–1526 |
| Bengali calendar | 1011 |
| Berber calendar | 2554 |
| English Regnal year | 1 Ja. 1 – 2 Ja. 1 |
| Buddhist calendar | 2148 |
| Burmese calendar | 966 |
| Byzantine calendar | 7112–7113 |
| Chinese calendar | 癸卯年 (Water Rabbit) 4301 or 4094 — to — 甲辰年 (Wood Dragon) 4302 or 4095 |
| Coptic calendar | 1320–1321 |
| Discordian calendar | 2770 |
| Ethiopian calendar | 1596–1597 |
| Hebrew calendar | 5364–5365 |
| Hindu calendars | |
| - Vikram Samvat | 1660–1661 |
| - Shaka Samvat | 1525–1526 |
| - Kali Yuga | 4704–4705 |
| Holocene calendar | 11604 |
| Igbo calendar | 604–605 |
| Iranian calendar | 982–983 |
| Islamic calendar | 1012–1013 |
| Japanese calendar | Keichō 9 (慶長９年) |
| Javanese calendar | 1524–1525 |
| Julian calendar | Gregorian minus 10 days |
| Korean calendar | 3937 |
| Minguo calendar | 308 before ROC 民前308年 |
| Nanakshahi calendar | 136 |
| Thai solar calendar | 2146–2147 |
| Tibetan calendar | 阴水兔年 (female Water-Rabbit) 1730 or 1349 or 577 — to — 阳木龙年 (male Wood-Dragon) 1731 or 1350 or 578 |
1604 (MDCIV) was a leap year starting on Thursday of the Gregorian calendar and a leap year starting on Sunday of the Julian calendar, the 1604th year of the Common Era (CE) and Anno Domini (AD) designations, the 604th year of the 2nd millennium, the 4th year of the 17th century, and the 5th year of the 1600s decade. As of the start of 1604, the Gregorian calendar was 10 days ahead of the Julian calendar, which remained in localized use until 1923.