Olimpiadas de Verano 2004 - Deportistas

Deportista	Deporte
Leah O'Brien-Amico
Cian O'Connor
Tela O'Donnell
Stuart O'Grady
Jermaine O'Neal
Kate O'Neill
Heather O'Reilly
Molly O'Rouke
Christina Obergfoell
Lenient Obia
Francis Obikwelu
Isabella Ochichi
Louise Oernstedt
Charlie Ogletree
Mariana Ohata
Christine Ohurougu
Jaakko Ojaniemi
Endurance Ojokolo
Emeka Okafor
Tetsu Okano
Margaret Okayo
Lidia Okninska
Effiong Okon
Reina Flor Okori
Yoshihiro Okumura