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

Embassy of Vietnam in Mongolia

Ench Taivny Urgun Chuluu 47, Ulaanbaatar, Mongolia – C.P.Box 670
Tel: (976) 145 4632 (976) 145 8917
Fax: (976) 145 8923

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

–          Visit Vietnam Embassy in Mongolia 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.