Little Saigon is a name given to ethnic enclaves of expatriate Vietnamese mainly in English-speaking countries. Alternate names include Little Vietnam and Little Hanoi, depending on the enclave's political history. To avoid political undertones due to the renaming of Saigon to Ho Chi Minh City, it is occasionally called by the neutral name Vietnamtown. Saigon is the former name of the capital of the former South Vietnam, where a large number of first-generation Vietnamese immigrants emigrating to the United States originate from, whereas Hanoi is the current capital of Vietnam.

Overseas Vietnamese refers to Vietnamese people who live outside Vietnam. There are approximately 5 million overseas Vietnamese, the largest community of whom live in the United States.