Long Thanh may refer to several places in Vietnam, including:
Long Thành Long Thành, Đồng Nai: a commune in the former Long Thành district, previously a township and district capital Long Thành, Vĩnh Long: a commune in the former Duyên Hải district, previously a township Long Thành district: a former district, dissolved in 2025 as part of the 2025 Vietnamese administrative reform Long Thanh International Airport: an airport in Đồng Nai, serving the Ho Chi Minh City metropolitan area
Long Thạnh Long Thạnh: a commune of An Giang province