The 2011 Southeast Asian Games, (Indonesian: Pesta Olahraga Asia Tenggara 2011) officially known as the 26th Southeast Asian Games, or the 26th SEA Games, and commonly known as Jakarta-Palembang 2011, were a Southeast Asian multi-sport event held from 11 to 22 November 2011 in Jakarta and Palembang, Indonesia. It was Indonesia's fourth time to host the Southeast Asian Games, and its first since 1997. Previously, Indonesia also hosted in 1979 and 1987. The capital city of Jakarta hosted all three of the previous Games prior to this. Palembang became the third SEA Games non-capital host city, after Chiang Mai (1995) and Nakhon Ratchasima (2007), both in Thailand. Around 5,965 athletes from 11 participating nations participated at the games which featured 545 events in 44 sports. The biggest competitor, sports, and events in Southeast Asian Games history.

The games was held from 11 to 22 November 2011, although several events had commenced from 3 November 2011. The games was opened by Susilo Bambang Yudhoyono, the President of Indonesia at the Gelora Sriwijaya Stadium in Palembang.

The final medal tally was led by host Indonesia, followed by Thailand and Vietnam, while Timor-Leste won its first ever Southeast Asian Games gold medal. Several Games and national records were broken during the games. Although there were several controversies, the Games were deemed generally successful with its promotion for conservative effort on endangered fauna species namely the komodo dragon through the mascot and with the rising standard of competition amongst the Southeast Asian nations.

Palembang, the capital city of South Sumatra was the main host of the games, while the nation's capital Jakarta was the co-host. As the main host, Palembang only held 22 of 42 sports, the rest was held by the co-host city. Palembang also hosted the opening and closing ceremonies.

Initially, the government had named four provinces as candidates to host the SEA Games 2011, namely Jakarta, West Java, Central Java, and South Sumatra. However this idea has been discarded and hosting rights was granted to only two provinces, Jakarta and South Sumatra. President Susilo Bambang Yudhoyono had suggested that this could simplify hosting and organization while reducing costs.

INASOC was the organising body for the games. The President of INASOC was Rita Subowo, who is also the then-President of the Indonesia Olympic Committee, with Rahmat Gobel, an entrepreneur and the President of Panasonic Gobel Indonesia, its director-general. The Indonesian government budget of 2010 gave a total of 350 billion rupiahs (≈US$38.7 million) for the games, while the budget of 2011 gave a total of 2.1 trillion rupiahs (≈US$230 million). According to the Indonesian Minister of Youth and Sports Andi Mallarangeng, the government of Indonesia added 1 trillion rupiahs (± US$110 million) from the government budget for the games, including 600 billion from the budget for the education sector and funds from sponsorship. The government of South Sumatra declared its commitment to incorporate eco-policies with the games. All venues during the games are smoke-free. Palembang, as the first city outside Jakarta to host the SEA Games, faced some environmental problems due to development for the games.

Venues in Palembang

Venues in Jakarta