From Argentina , visitors can apply for a visa through one of the embassy of Vietnam in Argentina below or apply for a Vietnam visa  online. Here below is the specific address of Vietnam Embassy you may concern:

Embassy of Vietnam in Buenos Aires, Argentina
Calle 11 de Septiembre 1442 C.P. 1426 – Capital Federal Argentina
Tel: (5411) 4783 1802 (5411) 4783 1825
Fax: (5411) 4728 0078

Besides, citizens in Argentina can select among 3 options to get visa to Vietnam:

–          Visit Vietnam Embassy in Argentina or in any other countries to get Vietnam visa done there.

–          Apply for Vietnam visa on arrival at https://vietnamvisaonentry.com/apply-online/ and pick up your visa at one of 3 international airports in Vietnam

–          Apply for Vietnam visa code at https://vietnamvisaonentry.com/apply-online/ and get visa stamped at Vietnam Embassy where you wish to pay a visit to.