The 2011 Southeast Asian Games, officially known as the 26th Southeast Asian Games (Indonesian: Pesta Olahraga Asia Tenggara 2011) was a Southeast Asian multi-sport event held 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 the 1979 games and the 1989 games. Around 4965 athletes from 11 participating nations participated at the games which featured 545 events in 42 sports.

Prior to the games, the capital city of Jakarta has been the host of Southeast Asian Games for three times, namely in 1979, 1987, and 1997, while Palembang is the third SEA Games host city which is not the national capital, after Chiang Mai (1995) and Nakhon Ratchasima (2007), Thailand. 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 and was closed by Boediono, the Vice President of Indonesia.

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. Though 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.

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