If you have a California or U.S. document that will be used in Vietnam, the authentication process has changed. On September 11, 2026, the Hague Apostille Convention entered into force for Vietnam. For covered public documents exchanged between the United States and Vietnam, an apostille generally replaces the longer consular legalization process that was previously required. This is an important change for individuals, families, students and businesses submitting U.S. docume