Administrative and technical staff refers to a category identified by the Vienna Convention on Diplomatic Relations (1961) within what used to be called the ‘ambassador’s suite’, these are the members of the staff of a diplomatic mission who carry out, for example, interpreting, secretarial, clerical, financial, and communications tasks.

They are distinguished from the diplomatic staff on the one hand and the service or domestic staff on the other but, controversially, were given by the Vienna Convention (together with their immediate families) almost the same range of privileges and immunities as the diplomatic staff, and certainly all of the important ones.