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{{Short description|International academic association}}
{{more citations needed|date=March 2012}}
{{for|the educational institution in Washington, D.C., United States|International Law Institute}}
{{Infobox organization
| name                = Institute of International Law
| pronounce           = 
| native_name         = Institut de Droit International
| native_name_lang    = FRA
| named_after         = 
| image               = 
| image_size          = 
| alt                 = 
| caption             = 
| logo                = Logo of Institut de Droit International.svg
| logo_size           = 
| logo_alt            = 
| logo_caption        = 
| abbreviation        = IIL, IDI
| formation           = {{start date and age|1873|9|8|df=yes}}
| founding_location   = [[Ghent]], [[Belgium]]
| type                = [[Non-governmental organization|NGO]], [[Intergovernmental organization|IGO]], [[Society]]
| status              = [[Institute]]
| purpose             = Promote the progress of international law
| headquarters        = [[Geneva]], [[Switzerland]]
| coords              = {{coord|46.220722|6.143681|display=inline, title}}
| region              = Worldwide
| methods             = Scientific research, publications, teaching and lobbying
| fields              = [[International law]]
| leader_title        = Secretary-General
| leader_name         = [[Marcelo Kohen]]
| affiliations        = Consultant – [[ECOSOC]] <br> Consultant – [[Hague Conference on Private International Law|HCCH]]
| website             = [http://www.idi-iil.org/en/ www.idi-iil.org]
| footnotes           = {{portal-inline|Law|size=tiny}}
}}

The '''Institute of International Law''' ({{langx|fr|'''Institut de Droit International'''}}) is an organization devoted to the study and development of [[international law]], whose membership comprises the world's leading public international lawyers. Established in 1873, it was awarded the [[Nobel Peace Prize]] in 1904.<ref>{{cite web |url= http://www.idi-iil.org/en/a-propos/prix-nobel-de-la-paix/ |title= Nobel Peace Prize |via= The Institute of International Law }}</ref>

==History==
The institute was founded by [[Gustave Moynier]] and [[Gustave Rolin-Jaequemyns]], together with nine other renowned international lawyers, on 8 September 1873 in the ''Salle de l'Arsenal'' of the [[Ghent]] [[Ghent City Hall|Town Hall]] in [[Belgium]]. The founders of 1873 were: 
* [[Pasquale Stanislao Mancini]] (from Rome), President
* [[Émile Louis Victor de Laveleye|Emile de Laveleye]] (from Liege) 
* [[Tobias Michael Carel Asser]] (from Amsterdam) 
* [[James Lorimer (jurist)|James Lorimer]] (from Edinburgh) 
* [[Wladimir Besobrassof]] (from Saint-Petersburg) 
* [[Gustave Moynier]] (from Geneva) 
* [[Johann Kaspar Bluntschli|Jean Gaspar Bluntschli]] (from Heidelberg) 
* [[Augusto Pierantoni]] (from Naples) 
* [[Carlos Calvo (historian)|Carlos Calvo]] (from Buenos Aires) 
* [[Gustave Rolin-Jaequemyns]] (from Ghent) 
* [[David Dudley Field]] (from New York)

In addition, [[August von Bulmerincq]] (from [[Tartu]]) was invited to participate at the founding event, but could not attend since the invitation did not reach him in time. He was later however counted among the founding members.<ref name=malksoo>{{cite journal |last1= Mälksoo|first1= Lauri|date= 2005|title=The Context of International Legal Arguments: 'Positivist' International Law Scholar August von Bulmerincq (1822-1890) and His Concept of Politics|url= https://doi.org/10.1163/157180505774763770|journal= Journal of the History of International Law / Revue d'histoire du droit international|volume=7|issue= 2|pages=181–209|doi= 10.1163/157180505774763770|access-date=12 August 2024|url-access= subscription}}</ref>

=== 150 years anniversary ===
In September 2023, the Institute celebrated its 150 year anniversary on the occasion of the 81st session that took place in [[Angers]], France.<ref>{{cite web | url=https://www.idi-iil.org/fr/session-dangers-2023-sesquicentenaire/ | title=Session d'Angers 2023 – sesquicentenaire – Institut de Droit International }}</ref> For the occasion, three French government ministers were invited to participate in the session and video messages from President of France [[Emmanuel Macron]] and United Nations Secretary-General [[António Guterres]], were presented during the ceremony.<ref>{{cite web | url=https://www.ouest-france.fr/pays-de-la-loire/angers-49000/angers-trois-ministres-vont-lancer-les-150-ans-de-linstitut-de-droit-international-dimanche-c00a085e-40e9-11ee-b6d7-a958e5b7485d | title=Angers. Trois ministres vont lancer les 150 ans de l'Institut de droit international dimanche | date=22 August 2023 }}</ref>
During this session, the Institute also launched a [[documentary film]] about the history of the organization. This documentary features many prominent international legal scholars as well as current judges at the [[International Court of Justice]].<ref>{{cite web | url=https://www.youtube.com/watch?v=JRGGWWwE-A4 | title=Institute of International Law - Justitia et Pace - Trailer | website=[[YouTube]] | date=28 August 2023 }}</ref>

==Organization==
[[Image:IDI Krakow Session 2005.jpg|thumb|left|Members of the Institute at the 2005 [[Kraków]] Session]]

The Institute is a private body, made up of associates, members, and honorary members. The Statute stipulates that the number of members and associates under the age of 80 cannot be over 132. The members, elected every two years by the current members of the organization, are persons who have demonstrated notable scholarly work in the area of international law, and is restricted to those who are considered relatively free of political pressure. The organisation attempts to have members broadly distributed around the world.

The organisation holds biannual congresses for the study of international law as it currently exists, and passes resolutions proposing modifications to international law. It does not comment on specific disputes.

While its recommendations cover international law in its many forms, some of its resolutions particularly pertain to [[international human rights law|human rights law]] and peaceful [[dispute resolution]]. It was for that reason that the organization received the [[Nobel Peace Prize]].<ref>{{Cite web|url=https://www.nobelprize.org/prizes/peace/1904/international-law/facts/|title=The Nobel Peace Prize 1904|website=NobelPrize.org|language=en|access-date=2019-12-11}}</ref>

The organization remains active, with the latest congress held in [[Angers]], France, in August 2023. The location of the institute's headquarters rotates according to the origin of the Secretary-General. The current headquarters are at the [[Graduate Institute of International and Development Studies]] in Geneva, Switzerland.

Current members of the Institute include, prominent lawyers, legal academics,<ref>{{cite web |url=http://www.idi-iil.org/idiE/navig_members.html |title=IDI-Membres |publisher=Idi-iil.org |access-date=2013-08-06 |url-status=dead |archive-url=https://web.archive.org/web/20130704193742/http://www.idi-iil.org/idiE/navig_members.html |archive-date=2013-07-04 }}</ref> former ambassadors, and judges of the [[International Court of Justice]] and the [[International Tribunal for the Law of the Sea]].

Recent resolutions from the organization cover many important areas such as universal jurisdiction, provisional measures, regime of wrecks, immunity, environment, use of force, etc.

The Institute publishes its ''Yearbook'', containing the reports of the commissions, deliberations of the plenary sessions, and any resulting declarations and resolutions. The records of the administrative sessions including elections are also included in the ''Yearbook''.

The Institute's website<ref>{{Cite web|url=https://www.idi-iil.org/en/|title=Institute of International Law – Justitia et Pace|website=www.idi-iil.org}}</ref> houses an online library of information, including, but not limited to, declarations, resolutions, and some works in progress for future inclusion in the ''Yearbook''.

{{Citation needed|date=February 2009}}

==References==
<references />
* {{cite journal | year = 1907 | title = Societies of International Law | journal = The American Journal of International Law | volume = 1 | issue = 1 | pages = 135–137 | doi = 10.2307/2186291 | jstor = 2186291 | s2cid = 251375336 }}

==External links==
* {{commonscatinline}}
* {{Official website|http://www.idi-iil.org/ }}
* {{Nobelprize|name=Institute of International Law}} including the Nobel Lecture ''The Work of the Institute of International Law''  
* {{PM20|TEXT=Documents and clippings about}}
* {{Internet Archive author |sname= L'Institut de Droit International}}

{{Nobel Peace Prize Laureates 1901-1925}}
{{1904 Nobel Prize winners}}

{{authority control}}

{{DEFAULTSORT:Institute of International Law}}
[[Category:Belgian Nobel laureates]]
[[Category:Organizations awarded Nobel Peace Prizes]]
[[Category:Legal research institutes]]
[[Category:Organizations established in 1873]]
[[Category:International law organizations]]
[[Category:Grez-Doiceau]]