| Years |
|---|
| Millennium |
| 2nd millennium |
| Centuries |
| Decades |
| Years |
| 1804 by topic |
|---|
| Arts, history, and science |
| Countries |
|
|
| Lists of leaders |
| Birth and death categories |
| Establishments and disestablishments categories |
| Works category |
1804 (MDCCCIV) was a leap year starting on Sunday in the Gregorian calendar and a leap year starting on Friday in the Julian calendar.