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Military or belligerent occupation (hereon after referred to as simply occupation) is effective provisional control by a certain ruling power over a territory, which is not under the formal sovereignty of that entity, without the violation of the actual sovereign.     The territory is then known as the occupied territory and the ruling power the occupant.  Occupation is distinguished from annexation by its intended temporary nature (i.e. no claim for permanent sovereignty), by its military nature, and by citizenship rights of the controlling power not being conferred upon the subjugated population.   
The rules of occupation are delineated in various international agreements, primarily the Hague Convention of 1907, the Geneva Conventions of 1949, as well as established state practice. The relevant international conventions, the International Committee of the Red Cross (ICRC) Commentaries, and other treaties by military scholars provide guidelines on such topics as rights and duties of the occupying power, protection of civilians, treatment of prisoners of war, coordination of relief efforts, issuance of travel documents, property rights of the populace, handling of cultural and art objects, management of refugees, and other concerns which are very important both before and after the cessation of hostilities. A country that establishes an occupation and violates internationally agreed upon norms runs the risk of censure, criticism, or condemnation. In the current era, the practices of occupations have largely become a part of customary international law, and form a part of the laws of war.
From the second half of the 18th century onwards, international law has come to distinguish between the occupation of a country and territorial acquisition by invasion and annexation,  the difference between the two being originally expounded upon by Emerich de Vattel in The Law of Nations (1758).  The clear distinction has been recognized among the principles of international law since the end of the Napoleonic wars in the 19th century.  These customary laws of occupation which evolved as part of the laws of war gave some protection to the population under the occupation of a belligerent power.[ citation needed]
The Hague Convention of 1907 codified these customary laws, specifically within "Laws and Customs of War on Land" (Hague IV); October 18, 1907: "Section III Military Authority over the territory of the hostile State".  The first two articles of that section state:
- Art. 42.
- Territory is considered occupied when it is actually placed under the authority of the hostile army.
- The occupation extends only to the territory where such authority has been established and can be exercised.
- Art. 43.
- The authority of the legitimate power having in fact passed into the hands of the occupant, the latter shall take all the measures in his power to restore, and ensure, as far as possible, public order and safety, while respecting, unless absolutely prevented, the laws in force in the country.
In 1949 these laws governing occupation of an enemy state's territory were further extended by the adoption of the Fourth Geneva Convention (GCIV). Much of GCIV is relevant to protected persons in occupied territories and Section III: Occupied territories is a specific section covering the issue.
Article 6 restricts the length of time that most of GCIV applies:
- The present Convention shall apply from the outset of any conflict or occupation mentioned in Article 2.
- In the territory of Parties to the conflict, the application of the present Convention shall cease on the general close of military operations.
- In the case of occupied territory, the application of the present Convention shall cease one year after the general close of military operations; however, the Occupying Power shall be bound, for the duration of the occupation, to the extent that such Power exercises the functions of government in such territory, by the provisions of the following Articles of the present Convention: 1 to 12, 27, 29 to 34, 47, 49, 51, 52, 53, 59, 61 to 77, 143.
GCIV emphasised an important change in international law. The United Nations Charter (June 26, 1945) had prohibited war of aggression (See articles 1.1, 2.3, 2.4) and GCIV Article 47, the first paragraph in Section III: Occupied territories, restricted the territorial gains which could be made through war by stating:
- Protected persons who are in occupied territory shall not be deprived, in any case or in any manner whatsoever, of the benefits of the present Convention by any change introduced, as the result of the occupation of a territory, into the institutions or government of the said territory, nor by any agreement concluded between the authorities of the occupied territories and the Occupying Power, nor by any annexation by the latter of the whole or part of the occupied territory.
Article 49 prohibits the forced mass movement of people out of or into occupied state's territory:
- Individual or mass forcible transfers, as well as deportations of protected persons from occupied territory to the territory of the Occupying Power or to that of any other country, occupied or not, are prohibited, regardless of their motive. ... The Occupying Power shall not deport or transfer parts of its own civilian population into the territory it occupies.
Protocol I (1977): "Protocol Additional to the Geneva Conventions of 12 August 1949, and relating to the Protection of Victims of International Armed Conflicts" has additional articles which cover occupation but many countries including the U.S. are not signatory to this additional protocol.
In the situation of a territorial cession as the result of war, the specification of a "receiving country" in the peace treaty merely means that the country in question is authorized by the international community to establish civil government in the territory. The military government of the principal occupying power will continue past the point in time when the peace treaty comes into force, until it is legally supplanted.
"Military government continues until legally supplanted" is the rule, as stated in Military Government and Martial Law, by William E. Birkhimer, 3rd edition 1914.
Article 42 of the 1907 Hague Convention on Land Warfare specifies that a "[t]erritory is considered occupied when it is actually placed under the authority of the hostile army." The form of administration by which an occupying power exercises government authority over occupied territory is called military government. Neither the Hague Conventions nor the Geneva Conventions specifically define or distinguish an act of "invasion". Article 2 of the Geneva Conventions expanded on this to include situations in which no armed resistance is encountered. 
There does not have to be a formal announcement of the beginning of a military government, nor is there any requirement of a specific number of people to be in place, for an occupation to commence. Birkhimer writes:
No proclamation of part of the victorious commander is necessary to the lawful inauguration and enforcement of military government. That government results from the fact that the former sovereignty is ousted, and the opposing army now has control. Yet the issuing such proclamation is useful as publishing to all living in the district occupied those rules of conduct which will govern the conqueror in the exercise of his authority. Wellington, indeed, as previously mentioned, said that the commander is bound to lay down distinctly the rules according to which his will is to be carried out. But the laws of war do not imperatively require this, and in very many instances it is not done. When it is not, the mere fact that the country is militarily occupied by the enemy is deemed sufficient notification to all concerned that the regular has been supplanted by a military government. (pp. 25-26)
The terminology of "the occupying power" as spoken of in the laws of war is most properly rendered as "the principal occupying power", or alternatively as "the occupying power". This is because the law of agency is always available (When the administrative authority for the occupation of particular areas is delegated to other troops, a "principal -- agent" relationship is in effect). 
Because the law of agency is a very general pattern, primarily applicable in this case as the means of regulating the relationships between the said "powers", but a question however in which considerations of logistics are sometimes to be taken in consideration, that definition is not always applicable outside of those contexts which can be analysed by analogy as related to warlording, even though it does relate more generally to all possible types of military coalitions.
In most contexts determined by the application of the defined and modern laws of war, delegation to agencies generally tends to relating to civilian organizations. Juridical considerations like the above remain in the other cases merely consensual between the said powers. For example, in 1948 the U.S. Military Tribunal in Nuremberg states:
In belligerent occupation the occupying power does not hold enemy territory by virtue of any legal right. On the contrary, it merely exercises a precarious and temporary actual control. This can be seen from Article 42 of the Hague Regulations which grants certain well limited rights to a military occupant only in enemy territory which is 'actually placed' under his control.
The conqueror is the principal occupying power.
The examples and perspective in this section deal primarily with the United States and do not represent a worldwide view of the subject. (August 2015) ( Learn how and when to remove this template message)
Rule: Occupation continues until legally supplanted. According to Eyal Benvenisti, occupation can end in a number of ways, such as: "loss of effective control, namely when the occupant is no longer capable of exercising its authority; through the genuine consent of the sovereign (the ousted government or an indigenous one) by the signing of a peace agreement; or by transferring authority to an indigenous government endorsed by the occupied population through referendum and which has received international recognition". 
This is explained as follows. For the situation where no territorial cession is involved, the occupation ends with the coming into force of the peace settlement.
- Example: (1) Japan after WWII. Japan regained its sovereignty with the coming into force of the San Francisco Peace Treaty on April 28, 1952. In other words, a civil government for Japan was in place and functioning as of this date.
In the situation of a territorial cession, there must be a formal peace treaty. However, the occupation does not end with the coming into force of the peace treaty.
- Example: (1) Puerto Rico after the Spanish–American War. Military government continued in Puerto Rico past the coming into force of the Treaty of Paris of 1898 on April 11, 1899, and only ended on May 1, 1900 with the beginning of Puerto Rico's civil government.
- Example: (2) Cuba after the Spanish–American War. Military government continued in Cuba past the coming into force of the Treaty of Paris of 1898 on April 11, 1899, and only ended on May 20, 1902 with the beginning of the Republic of Cuba's civil government.
Hence, at the most basic level, the terminology of "legally supplanted" is interpreted to mean "legally supplanted by a civil government fully recognized by the national (or "federal") government of the principal occupying power".
In most wars some territory is placed under the authority of the hostile army. Most occupations end with the cessation of hostilities. In some cases the occupied territory is returned and in others the land remains under the control of the occupying power but usually not as militarily occupied territory. Sometimes the status of presences is disputed by a party to the situation. The largest extending territories under military occupation came into existence as the outcome of World War I and World War II:
- Occupied Enemy Territory Administration (OETA), encompassing much of the Middle East during 1917-1920 - separated to French (OETA North) and British (OETA South) domains;
- Soviet occupation zone (1945-49) in the aftermath of World War II
- Allied-occupied Germany (1945-49) in the aftermath of World War II
Occupation is usually a temporary phase, preceding either the handing back of the territory, or its annexation. A significant number of post-1945 occupations have lasted more than two decades such as the occupations of Namibia by South Africa and of East Timor by Indonesia as well as the ongoing occupations of Northern Cyprus by Turkey and of Western Sahara by Morocco.  The world's longest ongoing occupation, and the longest in modern times by one single occupying power, is Israel’s occupation of the West Bank, including East Jerusalem (1967–present).  Other prolonging belligerent occupations that have been alleged include the occupation by the United Kingdom of the Falkland Islands/Malvinas (1833-present) which Argentina claims this as sovereign territory, of Tibet by China (1950-present), and of the Kingdom of Hawaii by the United States (1893-present). The War Report makes no determination as to whether belligerent occupation is occurring in these cases. 
The most recent cases of occupation, which took place in the 21st century are the:
- Gash-Barka Region taken over in 2000 during the Eritrean–Ethiopian War
- Iraq occupied by US during the Iraq War of 2003-2011
- Parts of Somalia occupied during the War in Somalia (2006–09)
- Gori and Poti occupied by Russia during the Russo-Georgian War
- Occupation of Crimea, followed by its annexation in 2014, during the 2014 pro-Russian unrest in Ukraine
- Turkish occupation of northern Syria in support of the Syrian opposition since 2015
- Takeover of Socotra in 2018 during the Yemeni Civil War
- Allied-occupied Germany
- Ex parte Milligan
- German-occupied Europe
- Rule of Law in Armed Conflicts Project
- A Roberts. Prolonged Military Occupation: The Israeli-Occupied Territories Since 1967 - Am. J. Int'l L., 1990, p. 47.
- Eyāl Benveniśtî. The international law of occupation. Princeton University Press, 2004. ISBN 0-691-12130-3, ISBN 978-0-691-12130-7, p. xvi
- Eran Halperin, Daniel Bar-Tal, Keren Sharvit, Nimrod Rosler and Amiram Raviv. Socio-psychological implications for an occupying society: The case of Israel. Journal of Peace Research 2010; 47; 59
- During civil wars, the districts occupied by rebels are considered to be foreign.Military Government and Martial Law LLMC, p. 21. 
- Fabre, Cécile. "Living with the enemy: the ethics of belligerent occupation" (PDF).
- David M. Edelstein. Occupational Hazards: Why Military Occupations Succeed or Fail. Journal of Peace Research 2010; 47; 59
- Stirk, Peter (2009).
The Politics of Military Occupation. Edinburgh University Press. p. 44.
The significance of the temporary nature of military occupation is that it brings about no change of allegiance. Military government remains an alien government whether of short or long duration, though prolonged occupation may encourage the occupying power to change military occupation into something else, namely annexation
- Roberts, Adam (1985). "What is a Military Occupation?". British Yearbook of International Law.
- Cole, Babaloba (1974). "Property and the Law of Belligerent Occupation: A Reexamination". World Affairs.
- Laws and Customs of War on Land" (Hague IV); October 18, 1907: "Section III Military Authority over the territory of the hostile State source The Avalon Project at the Yale Law School
- Ferraro, Tristan. "Determining the beginning and end of an occupation under international humanitarian law".
- Anonymous. "Chapter 5 – Definitions of Important Terminology and Concepts Related to Territorial Cessions". The True Legal Relationship between Taiwan & the USA. www.taiwanbasic.com. Retrieved 13 December 2013.[ unreliable source?]
- Yutaka Arai Takahashi (2009). The Law of Occupation: Continuity and Change of International Humanitarian Law. p. 7. ISBN 978-90-04-16246-4.
- Eyal Benvenisti (23 February 2012).
The International Law of Occupation. OUP Oxford. p. 56.
The conditions that define when occupation begins also identify when it ends. Obviously, occupation can end in a number of ways: with the loss of effective control, namely when the occupant is no longer capable of exercising its authority; through the genuine consent of the sovereign (the ousted government or an indigenous one) by the signing of a peace agreement; or by transferring authority to an indigenous government endorsed by the occupied population through referendum and which has received international recognition.
- Weill, Sharon (2014).
The Role of National Courts in Applying International Humanitarian Law. Oxford University Press. p. 22.
Although the basic philosophy behind the law of military occupation is that it is a temporary situation modem occupations have well demonstrated that rien ne dure comme le provisoire A significant number of post-1945 occupations have lasted more than two decades such as the occupations of Namibia by South Africa and of East Timor by Indonesia as well as the ongoing occupations of Northern Cyprus by Turkey and of Western Sahara by Morocco. The Israeli occupation of the Palestinian territories, which is the longest in all occupation's history has already entered its fifth decade.
- The majority of the international community (including the UN General Assembly, the United Nations Security Council, the European Union, the International Criminal Court, and the vast majority of human rights organizations) considers Israel to be occupying Gaza, the West Bank and East Jerusalem.
The government of Israel and some supporters have, at times, disputed this position of the international community. For more details of this terminology dispute, including with respect to the current status of the Gaza Strip, see International views on the Israeli-occupied territories and Status of territories captured by Israel.
See for example:
* Hajjar, Lisa (2005). Courting Conflict: The Israeli Military Court System in the West Bank and Gaza. University of California Press. p. 96. ISBN 0520241940.
The Israeli occupation of the West Bank and Gaza is the longest military occupation in modern times.
* Anderson, Perry (July–August 2001). "Editorial: Scurrying Towards Bethlehem". New Left Review. 10.
...longest official military occupation of modern history—currently entering its thirty-fifth year
* Makdisi, Saree (2010). Palestine Inside Out: An Everyday Occupation. W. W. Norton & Company. ISBN 9780393338447.
...longest-lasting military occupation of the modern age
* Kretzmer, David (Spring 2012). "The law of belligerent occupation in the Supreme Court of Israel" (PDF). International Review of the Red Cross. 94 (885). doi: 10.1017/S1816383112000446.
This is probably the longest occupation in modern international relations, and it holds a central place in all literature on the law of belligerent occupation since the early 1970s
* Said, Edward (2003). Culture and Resistance: Conversations with Edward W. Said. Pluto Press. p. 33. ISBN 9780745320175.
These are settlements and a military occupation that is the longest in the twentieth and twenty-first century, the longest formerly being the Japanese occupation of Korea from 1910 to 1945. So this is thirty-three years old, pushing the record.
*Alexandrowicz, Ra'anan (24 January 2012), The Justice of Occupation, The New York Times,
Israel is the only modern state that has held territories under military occupation for over four decades
- The War Report: Armed Conflict in 2014 (2015) reports (p. 24), "Other belligerent occupations that have been alleged include the occupation by the United Kingdom of the Falkland Islands/Malvinas (Argentina claims this as sovereign territory), of Tibet by China, and of the Hawaiian Kingdom by the United States. The War Report makes no determination as to whether belligerent occupation is occurring in these cases."
|Wikimedia Commons has media related to Military occupation.|
- Occupied territory - the legal issues, legal provisions regarding occupation of territory by hostile power and implications for people protected by IHL.
- David Kretzmer, Occupation of Justice: The Supreme Court of Israel and the Occupied Territories, State University of New York Press, April, 2002, trade paperback, 262 pages, ISBN 0-7914-5338-3; hardcover, July, 2002, ISBN 0-7914-5337-5
- Sander D. Dikker Hupkes, What Constitutes Occupation? Israel as the occupying power in the Gaza Strip after the Disengagement, Leiden: Jongbloed 2008, 110 pages, ISBN 978-90-70062-45-3 Openacces
- Belligerent Occupation
- The Law of Belligerent Occupation Michal N. Schmitt (regarding occupation of Iraq)
- Law of Belligerent Occupation, Judge Advocate General's School, United States Army
- Military Government and Martial Law, by William E. Birkhimer, third edition, revised (1914), Kansas City, Missouri, Franklin Hudson Publishing Co.
- FM 27-10 "The Law of Land Warfare," DEPARTMENT OF THE ARMY, WASHINGTON 25, D.C., 18 July 1956. (This manual supersedes FM 27-10, 1 October 1940, including C 1, 15 November 1944. Changes required on 15 July 1976, have been incorporated within this document.) Chapter 6, OCCUPATION 
- Bellal, A. (editor). (2015) The war report: Armed conflict in 2014. United Kingdom: Oxford University Press.