First Secretary

First Secretary is a standard diplomatic rank used in the foreign services of most states and recognised under the Vienna Convention on Diplomatic Relations (1961), which establishes the categories of diplomatic agents and the general staffing structure of missions without prescribing every internal rank.

Within the conventional embassy hierarchy, First Secretaries sit between Second Secretaries and Counsellors, and below Ministers and the Head of Mission (Ambassador or Chargé d'Affaires). They are normally accredited as members of the diplomatic staff, meaning they enjoy full diplomatic immunities and privileges under Articles 29–36 of the Vienna Convention.

Functionally, a First Secretary usually leads a substantive portfolio or section within the mission. Common assignments include:

• Political reporting on the host country's domestic politics, foreign policy, and key personalities.
• Economic and commercial analysis, including trade negotiations and sanctions implementation.
• Consular supervision over visa and citizen-services operations.
• Multilateral coordination at permanent missions to bodies such as the UN, WTO, or EU, where First Secretaries often serve as the principal negotiators in working groups and committees.

At multilateral missions, First Secretaries frequently act as their delegation's representatives in technical committees — for instance, sitting in the Sixth Committee of the UN General Assembly or in EU Council working parties — drafting interventions, negotiating text, and reporting back to the Counsellor or Deputy Permanent Representative.

The rank should not be confused with the political title First Secretary used by communist and some socialist parties (e.g., First Secretary of the Communist Party of the Soviet Union), nor with the British cabinet post First Secretary of State, both of which are unrelated domestic offices.