Accreditation of Diplomatic Agents

Procedure Diplomatic Practice Preferred

Process by which a sending State appoints a diplomat and the receiving State accepts that person in that role.

Independent referenceNot an official or legal definition
Sources citedSee the sources at the end of this page
Status Under reviewLast updated 11 October 2026
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Definition

In plain language

Accreditation is the official step that lets a diplomat start working in a foreign country. The home government appoints the person, and the host government agrees to receive them.

Academic definition

Under the 1961 Vienna Convention on Diplomatic Relations the sending State chooses its mission staff freely, but a head of mission needs the receiving State's prior agrément (Article 4) and the other diplomatic staff must be notified (Article 10). A head of mission is treated as having taken up functions on presenting credentials or on notifying arrival with a true copy of them, according to the practice of the receiving State (Article 13). The procedure therefore combines unilateral appointment with bilateral consent, and Article 5 allows one head of mission to be accredited to several States unless a receiving State objects.

Classification

Term type
Procedure
Category
Diplomatic Practice
Subject field
Diplomatic Law
Subfield
Establishment of Missions and Appointment of Staff
Difficulty level
Intermediate
Grammatical category
noun phrase

Language variants

Alternative terms
  • accreditation of envoys
  • appointment of diplomatic agents
Non-preferred terms
  • diplomatic registration
Abbreviations
  • not_applicable
Acronyms
  • not_applicable
Native terms
  • accréditation (French)
Transliteration
not_applicable
Pronunciation
not_applicable

Context

Legal effect: Binding

Scope

Covers appointment and acceptance of diplomatic agents, from agrément through credentials to the start of functions; it does not cover the later termination of functions or the privileges attached to the post.

Legal context

Articles 4, 5, 7, 10 and 13 of the 1961 VCDR set the rules; Article 7 gives the sending State free choice of staff except for military, naval or air attachés, whose names the receiving State may require in advance. Article 14 divides heads of mission into ambassadors or nuncios, envoys, and chargés d'affaires, and Article 9 lets the receiving State withdraw its acceptance at any time through a persona non grata declaration.

Diplomatic context

A typical sequence is a confidential agrément request, a decree or letter of appointment, arrival notification to the protocol department, and a credentials ceremony with the head of state. Until credentials are accepted or arrival is notified the ambassador usually cannot formally act, and many States schedule credentials ceremonies in batches.

Institutional context

Handled by the sending State's foreign ministry and head of state, and by the receiving State's protocol department, which also issues diplomatic identity cards; international organizations run their own accreditation of permanent representatives through the Secretariat.

Historical context

Resident missions with formal credentials developed in Renaissance Italy and were fixed in rank by the Congress of Vienna regulation of 1815, then codified in 1961.

Why it matters

Accreditation fixes the date from which a diplomat's privileges and immunities and official standing begin, so errors or delays can leave a representative without legal protection or recognized authority.

Usage

Register: Formal Diplomatic

Usage note

Say 'accredited to' a State and 'accredited at' or 'to' an organization; do not use 'accreditation' for the agrément stage alone, which is only the first step.

Example

The ambassador was accredited to the host State only after her credentials were accepted by the head of state.

Example scenario

State A names a new ambassador to State B and sends a confidential agrément request. State B agrees, the ambassador arrives and notifies the foreign ministry with a copy of her credentials, and later presents the originals at a ceremony; from the notification her functions are treated as begun under State B's practice.

Common misuse

Using 'accreditation' to mean only the presentation of credentials; the full process also includes agrément and notification, and the legal effect can begin before the ceremony.

Not to be confused with

  • Agrément (prior consent to a proposed head of mission)
  • Letters of credence (the document presented by an ambassador)
  • Exequatur (consular authorization)

Sources

  1. Vienna Convention on Diplomatic Relations (1961), United Nations, Articles 4, 5, 7, 10 and 13. legal.un.org
  2. Official definition. not_found_in_source
  3. Treaty reference. legal.un.org
  4. Denza, Diplomatic Law: Commentary on the Vienna Convention on Diplomatic Relations. not_found_in_source
  5. Satow's Diplomatic Practice. not_found_in_source

Source type: Treaty. Source reliability: Primary.

This entry is an independent reference definition, not an official or legally binding text. Where an official definition exists, it is linked above and is authoritative. Read our methodology.

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