The qualification for 2004 Men's Olympic Volleyball Tournament was held from 7 September 2003 to 30 May 2004.
FIVB reserved a vacancy for the 2004 Olympic Games host country to participate in the tournament.
The Asian Qualification Tournament combined with 2nd World Qualification Tournament. The hosts Japan and the top four ranked teams except Japan from the 2003 Asian Championship competed in the tournament. The top ranked among the five teams except the winners of the 2nd World Qualification Tournament qualified for the 2004 Olympic Games as Asian Qualification Tournament winners.
* The top four teams from 2003 Asian Championship were predetermined to be in 2nd tournament in Japan.