The 2003 Southeast Asian Games, officially known as the 22nd Southeast Asian Games, SEA Games 22 and also known as Vietnam 2003, was a Southeast Asian multi-sport event held from 5 to 13 December 2003 in Hanoi, Vietnam. This was the first time that Vietnam had staged the SEA Games, and it saw East Timor, which had just gained independence in 2002; although not being an ASEAN member and despite its geographical location closer to the Pacific archipelago than the Asian continent, making its debut at the games.

SEA Games, officially known as the South East Asian Games, is a biennial multi-sport event involving participants from the current 11 countries of Southeast Asia. The games are under the regulation of the Southeast Asian Games Federation with supervision by the International Olympic Committee (IOC) and the Olympic Council of Asia (OCA). The SEA Games is one of the five subregional Games of the Olympic Council of Asia (OCA).