The United Nations Mercenary Convention, officially the International Convention against the Recruitment, Use, Financing and Training of Mercenaries, is a 2001 United Nations treaty that prohibits the recruitment, training, use, and financing of mercenaries. At the 72nd plenary meeting on 4 December 1989, the United Nations General Assembly concluded the convention as its resolution 44/34. The convention entered into force on 20 October 2001 and has been ratified by 46 states. The convention extends on the Geneva Conventions Protocol I which in Article 47(1) states that a mercenary cannot be a lawful combatant or prisoner of war.

Article 1 (Definition of mercenary)

Article 1 of the Convention has the following definition of a mercenary:

Article 2

"Any person who recruits, uses, finances or trains mercenaries, as defined in article 1 of the present Convention, commits an offence for the purposes of the Convention."

Article 3

"# A mercenary, as defined in article 1 of the present Convention, who participates directly in hostilities or in a concerted act of violence, as the case may be, commits an offence for the purposes of the Convention.

Article 4

"An offence is committed by any person who: (a) Attempts to commit one of the offences set forth in the present Convention; (b) Is the accomplice of a person who commits or attempts to commit any of the offences set forth in the present Convention."

Article 5

"# States Parties shall not recruit, use, finance or train mercenaries and shall prohibit such activities in accordance with the provisions of the present Convention.

Article 6

"States Parties shall co-operate in the prevention of the offences set forth in the present Convention, particularly by: (a) Taking all practicable measures to prevent preparations in their respective territories for the commission of those offences within or outside their territories, including the prohibition of illegal activities of persons, groups and organizations that encourage, instigate, organize or engage in the perpetration of such offences; (b) Co-ordinating the taking of administrative and other measures as appropriate to prevent the commission of those offences."

Article 7

"States Parties shall co-operate in taking the necessary measures for the implementation of the present Convention."

Signatories and parties

As of August 2021, the convention had been ratified by 37 states, and signed but not ratified by 9 states. Below are the states that have signed, ratified or acceded to the convention. Several of the states that ratified the agreement are however signatories of the Montreux document which on the contrary of the afore-written convention, does not make illegal the use of mercenaries but gives a document about the use of mercenaries including "good practises", the agreement having no sanctions or legal constraints tied to it.