O.A.C.A. Olympic Indoor Hall

The men's tournament of water polo at the 2004 Summer Olympics at Athens, Greece, began on August 15 and lasted until August 29, 2004.

The Olympic Athletic Center of Athens Spiros Louis (Greek: Ολυμπιακό Αθλητικό Κέντρο Αθηνών "Σπύρος Λούης", Olympiakó Athlitikó Kéntro Athinón "Spýros Loúis") or OACA (OAKA)), is a sport facilities complex located at Marousi, in the north section of the city. The complex consists of five major venues as well as other supplementary sport facilities. The Olympic Athletic Center of Athens has hosted the Mediterranean Games in 1991, the World Championship in Athletics in 1997 as well as other important athletic and cultural events. The most significant event the Athens Olympic Sports Complex has hosted, was the Olympic Games. OACA was the main venue for the Athens Olympic Games in 2004. The complex was revamped for the games under a design produced by the Spanish architect Santiago Calatrava.

The opening ceremony of the 2004 Summer Olympics was held on August 13, 2004 starting at 20:45 EEST (UTC+3) at the Olympic Stadium in Marousi, Greece, a suburb of Athens. As mandated by the Olympic Charter, the proceedings combined the formal and ceremonial opening of this international sporting event, including welcoming speeches, hoisting of the flags and the parade of athletes, with an artistic spectacle to showcase the host nation's culture and history. 72,000 spectators (with nearly 50 world leaders) attended the event, with approximately 15,000 athletes from 202 countries participating in the ceremony as well. It marked the first-ever international broadcast of high-definition television, undertaken by the U.S. broadcaster NBC and the Japanese broadcaster NHK. The Games were officially opened by President of the Hellenic Republic Konstantinos Stephanopoulos at 23:46 EEST (UTC+3).

The closing ceremony of the 2004 Summer Olympics was held on 29 August 2004 21:15 EEST (UTC+3) at the Olympic Stadium, in Marousi, Greece, a suburb of Athens.

The women's discus throw competition at the 2004 Summer Olympics in Athens was held at the Olympic Stadium on 20–21 August. It was originally planned to hold the discus throw at the Ancient Olympia Stadium, but it was discovered that the field was not large enough to accommodate the range of modern discus throwers, and would have posed a danger to spectators. As such, it was decided to move the discus throw and to hold the shot put at the ancient stadium, despite the fact that the shot put was not contested at the Ancient Olympic Games.On December 5, 2012, Belarusian discus thrower Iryna Yatchenko was stripped of her bronze medal after drug re-testings of her samples on methandienone had been discovered positive. Following the announcement of Yatchenko's disqualification, the International Olympic Committee Executive Board had distributed and awarded the bronze to Czech Republic's Věra Pospíšilová-Cechlová, who originally finished fourth in the final.

The Athens Olympic Aquatic Centre is a complex at the Athens Olympic Sports Complex in Marousi, Athens, Greece, consisting of two outdoor pools and one indoor pool, that was built for the 1991 Mediterranean Games. It was refurbished and expanded for the 2004 Summer Olympics and the 2004 Summer Paralympics. The larger of the two outdoor pools, which seats 11,500 spectators, hosted swimming and water polo events. The smaller pool, which hosted synchronized swimming, had the capacity for 5.300 people. The indoor pool also hosted the water polo finals and diving and the swimming during the Paralympics had capacity for another 6.300 persons. The outdoor pool was the subject of significant controversy during the run-up to the Olympic Games. At the bidding process, the Bidding Committee and the Greek Government promised that the outdoor pools would gain cover to meet the necessary conditions requested by FINA at the time. But, due to the inflation of the Game's works and the constant delays, it was decided that the planned coverage would have to wait for later, which until 2023 has not happened. According to preliminary assessments, the roof would serve to protect both athletes and spectators from the scorching sun and summer heat of Athens, which were even worse in the pools because of their location in the west. However, this ended up not happening because of inflated costs and constant delays in other works that were more urgent and there is no option, FINA approved the holding of events in outdoor pools that received temporary bleachers to reach the minimum required capacity these bleachers were higher than the fixed ones and provided shade for the outdoor pools and other areas of the complex, but not for the present public. Since 2005, outdoor pools have been used to host swimming programs during the period between the late spring to the early winter. During the high winter period, the programs were held in the indoor pools.In 2023, the two outdoor pools remain wide open to the sky.The location of the Olympic games was well thought out and needed a great place to be for Athens. The city of Athens wanted to use this opportunity to help improve the living and the quality of urban space. The hosting of these Olympic games and the urban regeneration hoped to be the start of a newer and better urban living. Unfortunately, after the games, the city did not have any set plans to do so. The last master plan dated back to 1985, and the next one was adopted in 2014, so they did not get the most out of the opportunity. It is known that the dynamics of urban cities have been strongly influenced by late 20th-century economic globalization. Hosting the 2004 Olympics at this aquatic center has helped Athens's economic growth and helped enhance the globalization of the urban areas. The aquatic center got many upgrades as well, which they made to ensure that the looks were up to date with global standards. Athens Olympic Aquatic Centre for the 2004 Olympics had a contract with the company PICO to supply the overlays to every Olympic center that was hosting the Olympic games. The Aquatic Centre needed many service overlays, tents, and stations to host all of the behind-the-scenes portions of the 2004 Olympics. This insured that the cameramen had the perfect locations to film, the security had tents and barricades set up so people could not sneak in, and insured the looks of the aquatic center were looking the best. They supplied nearly 1000 flag and banner poles, hanging up a variety of countries' flags and more.

The Athens Olympic Velodrome is a velodrome stadium that is located in Marousi, Athens, Greece, at the Athens Olympic Sports Complex. The venue, which have the capacity for 5,250 people, but only 3,300 seats were used due the security measures available for the 2004 Summer Olympic Games and the 2004 Summer Paralympics. It has distinctive twin roofs, covering the stands on each side.

The men's individual pursuit event in cycling at the 2004 Summer Olympics consisted of matches between two cyclists. The riders would start at opposite ends of the track. Each had 16 laps (4 kilometres) in which to catch the other cyclist. If neither was caught before one had gone 16 laps, the times for the distance were used to determine the victor. In the thirteen matches of the 2004 event, no cyclist was lapped.

Eirini (Greek: Ειρήνη), also known as Irini on signage, is a station on Line 1 of the Athens Metro. It is adjacent to the Athens Olympic Sports Complex in Marousi, a northern suburb of Athens, Greece, 20.850 kilometres (12.956 mi) from the starting point of the line at Piraeus. It opened on 3 September 1982 and was renovated in 2004.

AEK Athletic Club was one of the first Greek clubs to found a youth academy back in 1934, while AEK Athens Football Club have managed them since 1979.

Tennis at the 2004 Summer Olympics in Athens took place on ten separate courts at the Olympic Tennis Centre. The surface was hardcourt. 172 players competed in four events. 2004 saw more of the top ranked players appearing, as this tournament saw world ranking points allocated to the players for the first time. Martina Navratilova made her first appearance at the Olympic Games where she partnered with Lisa Raymond in the ladies doubles.

The Athens Olympic Tennis Centre is a grouping of 16 tennis courts at the Athens Olympic Sports Complex, in Marousi, Athens, Greece. The centre consists of a main stadium, known as The Main Court, seating 8,600 fans - though only 6,000 seats were made publicly available during the 2004 Summer Olympics and 2004 Summer Paralympics- two semifinal courts, seating 4,300 spectators - though only 3,200 seats were made publicly available during the Olympics - and thirteen side courts, seating 200 observers each. Each of the courts use the DecoTurf cushioned acrylic surface, the same surface as the U.S. Open Grand Slam event. The Main Court, in particular, is extremely large by the standards of major tennis competitions, with the seats being relatively far removed from the tennis court.