Iran competed at the 2004 Summer Olympics in Athens, Greece, from 13 to 29 August 2004.

The National Olympic Committee of the Islamic Republic of Iran sent a total of 38 athletes, 37 men and 1 woman, to compete in 10 sports.

Half-lightweight judoka Arash Miresmaeili, who later forfeited his first match against Israel's Ehud Vaks for medical reasons, was the nation's flag bearer in the opening ceremony.

Taekwondo jin Hadi Saei claimed his first ever Olympic title in the men's featherweight division, in addition to his bronze medal from Sydney.

[10] Half-lightweight judoka Arash Miresmaeili forfeited his first match against Israel's Ehud Vaks, and accepted his disqualification from the International Judo Federation because a medical condition left him much heavier to fight.