Back 1804 Abkhazian 1804 Afrikaans 1804 ALS 1804 እ.ኤ.አ. Amharic 1804 AN 1804 Arabic 1804 ARY 1804 ARZ 1804 AST 1804 AVK
| Millennium: | 2nd millennium |
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| Gregorian calendar | 1804 MDCCCIV |
| French Republican calendar | 12–13 |
| Ab urbe condita | 2557 |
| Armenian calendar | 1253 ԹՎ ՌՄԾԳ |
| Assyrian calendar | 6554 |
| Balinese saka calendar | 1725–1726 |
| Bengali calendar | 1211 |
| Berber calendar | 2754 |
| British Regnal year | 44 Geo. 3 – 45 Geo. 3 |
| Buddhist calendar | 2348 |
| Burmese calendar | 1166 |
| Byzantine calendar | 7312–7313 |
| Chinese calendar | 癸亥年 (Water Pig) 4501 or 4294 — to — 甲子年 (Wood Rat) 4502 or 4295 |
| Coptic calendar | 1520–1521 |
| Discordian calendar | 2970 |
| Ethiopian calendar | 1796–1797 |
| Hebrew calendar | 5564–5565 |
| Hindu calendars | |
| - Vikram Samvat | 1860–1861 |
| - Shaka Samvat | 1725–1726 |
| - Kali Yuga | 4904–4905 |
| Holocene calendar | 11804 |
| Igbo calendar | 804–805 |
| Iranian calendar | 1182–1183 |
| Islamic calendar | 1218–1219 |
| Japanese calendar | Kyōwa 3 / Bunka 1 (文化元年) |
| Javanese calendar | 1730–1731 |
| Julian calendar | Gregorian minus 12 days |
| Korean calendar | 4137 |
| Minguo calendar | 108 before ROC 民前108年 |
| Nanakshahi calendar | 336 |
| Thai solar calendar | 2346–2347 |
| Tibetan calendar | 阴水猪年 (female Water-Pig) 1930 or 1549 or 777 — to — 阳木鼠年 (male Wood-Rat) 1931 or 1550 or 778 |
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1804 (MDCCCIV) was a leap year starting on Sunday of the Gregorian calendar and a leap year starting on Friday of the Julian calendar, the 1804th year of the Common Era (CE) and Anno Domini (AD) designations, the 804th year of the 2nd millennium, the 4th year of the 19th century, and the 5th year of the 1800s decade. As of the start of 1804, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.