The following is a list of squads for each nation competing in men's football at the 2004 Summer Olympics in Athens. Each nation must submit a squad of 18 players, 15 of whom must be born on or after 1 January 1981, and three of whom can be older dispensation players.

Group A

Greece

<section begin=GRE />The following is the Greek squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Stratos Apostolakis](https://bliptext.com/articles/stratos-apostolakis) * Over-aged player.<section end=GRE />

Mali

<section begin=MLI />The following is the Malian squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Cheick Oumar Kone](https://bliptext.com/articles/cheick-oumar-kone) * Over-aged player.<section end=MLI />

Mexico

<section begin=MEX />The following is the Mexican squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [🇦🇷](https://bliptext.com/articles/argentina) [Ricardo La Volpe](https://bliptext.com/articles/ricardo-la-volpe) * Over-aged player.<section end=MEX />

South Korea

<section begin=KOR />The following is the South Korean squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Kim Ho-kon](https://bliptext.com/articles/kim-ho-kon) * Over-aged player.<section end=KOR />

Group B

Ghana

<section begin=GHA />The following is the Ghanaian squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Mariano Barreto](https://bliptext.com/articles/mariano-barreto) * Over-aged player.<section end=GHA />

Italy

<section begin=ITA />The following is the Italian squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Claudio Gentile](https://bliptext.com/articles/claudio-gentile) * Over-aged player.<section end=ITA />

Japan

<section begin=JPN />The following is the Japanese squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Masakuni Yamamoto](https://bliptext.com/articles/masakuni-yamamoto) * Over-aged player.<section end=JPN />

Paraguay

<section begin=PAR />The following is the Paraguayan squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Carlos Jara Saguier](https://bliptext.com/articles/carlos-jara-saguier) * Over-aged player.<section end=PAR />

Group C

Argentina

<section begin=ARG />The following is the Argentine squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Marcelo Bielsa](https://bliptext.com/articles/marcelo-bielsa) * Over-aged player. <section end=ARG />

Australia

<section begin=AUS />The following is the Australian squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Frank Farina](https://bliptext.com/articles/frank-farina) * Over-aged player.<section end=AUS />

Serbia and Montenegro

<section begin=SCG />The following is the Serbia and Montenegrin squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Vladimir Petrović](https://bliptext.com/articles/vladimir-petrovi) * Over-aged player.<section end=SCG />

Tunisia

<section begin=TUN />The following is the Tunisian squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Khemais Labidi](https://bliptext.com/articles/khemais-labidi) * Over-aged player.<section end=TUN />

Group D

Costa Rica

<section begin=CRC />The following is the Costa Rican squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Rodrigo Kenton](https://bliptext.com/articles/rodrigo-kenton) * Over-aged player.<section end=CRC />

Iraq

<section begin=IRQ />The following is the Iraqi squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Adnan Hamad](https://bliptext.com/articles/adnan-hamad) * Over-aged player.<section end=IRQ />

Morocco

<section begin=MAR />The following is the Moroccan squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [Mustapha Madih](https://bliptext.com/articles/mustapha-madih) * Over-aged player.<section end=MAR />

Portugal

<section begin=POR />The following is the Portuguese squad in the men's football tournament of the 2004 Summer Olympics. Head coach: [José Romão](https://bliptext.com/articles/jos-rom-o) * Over-aged player.<section end=POR />