In diplomacy, an "Envoy Extraordinary and Minister Plenipotentiary", in short Envoy, is under the terms of the Congress of Vienna of 1815, a diplomat of the second class, ranking between an Ambassador and a Minister Resident.

Usually just referred to as a Minister, an Envoy is a diplomatic representative, not considered a representative of the head of state, but nonetheless with plenipotentiary powers (i.e. full authority to represent the government). A diplomatic mission headed by an Envoy would be called a Legation rather than an Embassy. Envoys are entitled to use the style "His/Her Excellency".