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

Vietnam Embassy 
12–14 Victoria Road
London W8 5RD

Telephone: (020) 7937 1912
Fax:              (020) 7937 6108

Nearest Underground Tube station: High Street Kensington. For a local street map, click here

Office hours:

Consular section: Monday-Friday 09.30- 12.30

Chancery: Monday-Friday 09.00- 17.00

Vietnam Embassy website

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

–          Visit Vietnam Embassy in Northern Ireland 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.