2004 (MMIV) was a leap year that started on a Thursday. In the Gregorian calendar, the year 2004 was the 2004th year of Anno Domini or the Common Era designation, the 4th year in the 3rd millennium and of the 21st century, and the 5th in the 2000s decade.
The year 2004 was designated the:
- International Year of Rice (by the United Nations)
- International Year to Commemorate the Struggle Against Slavery and its Abolition (by UNESCO)
- 2004 World Health Day topic was Road Safety (by World Health Organization)