The 2011 Southeast Asian Games, officially known as the 26th Southeast Asian Games, or the 26th SEA Games, and commonly known as Jakarta-Palembang 2011, was 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.

Palembang is the capital city of the Indonesian province of South Sumatra. The city proper covers 352.51 square kilometres on both banks of the Musi River in the eastern lowlands of southern Sumatra. It had a population of 1,668,848 at the 2020 Census; the official estimate as at mid 2022 was 1,729,546. Palembang is the second most populous city in Sumatra, after Medan, and the twelfth most populous city in Indonesia.