Year 2004 ( MMIV ) was a leap year starting on Thursday of the Gregorian calendar.

The year 2004 has been 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)
• Year of the Monkey (by the Chinese calendar).