Venues of the 2004 Summer Olympics

For the 2004 Summer Olympics, a total of thirty-five sports venues were used. Athens hosted the first modern Olympic Games in 1896, which used venues such as Panathinaiko Stadium and the city of Marathon for which the long-distance race would be named. From the end of the 1896 Games until the late 1970s, Greece underwent numerous political changes that included the Balkan Wars, two World Wars, a civil war, and a military coup that resulted in a junta that lasted from 1967 to 1974. A change in democracy in 1975 resulted in Greece's admission into the European Economic Community (now the European Union) in 1979.

Athens first bid for the 1996 Summer Olympics as part of the 100th anniversary of the Modern Olympics, but was upset by Atlanta, Georgia, in the United States for the Games in 1990. Seven years later, Athens won the right to host the 2004 Summer Olympics. At the time of the awarding, 75% of competition and 92% of training venues were available though a massive construction, and a renovation program was taken to get the venues ready for the games. Accessibility and environmental issues were taken into account in venue design and construction. The marathon course used was the same one used for the 1896 Games, though it was 2.195 km (1.36 mi) longer due to the marathon not being standardized until 1924. Canoe slalom's venue at Ellinikon was the first using saltwater, having it pumped in from the Aegean Sea. After the Olympics, the Markopoulo Olympic Shooting Centre was converted into a police training center, while two other venues were converted into entertainment centers.