Updated: 2017-03-27.
A non-resident mission is a diplomatic organization seeking to represent the people and interests of its state in another, though its host does not fully-recognize the sovereignty or existence of that state which it represents. As opposed to a resident mission.
An example of a non-resident mission might be Somaliland’s Representative Offices, which has outposts in cities such as London and Rome; Somaliland is recognized by most of the international community as a part of the country of Somalia, though it functions as a sovereign state, self-declared.
See also: consul, consul-general, consulate, consulate-general, embassy, resident mission, diplomatic mission.