A joint issue is the release of stamps or postal stationery by two or more countries to commemorate the same topic, event or person. Joint issues typically have the same first day of issue and their design is often similar or identical, except for the identification of country and value.

Continental joint issues

Europa postage stamps : Between 1956 and 1973 the postal authorities of several European nations issued stamps with a common design but since 1974 a common topic is used on stamps issued each year. These are not true joint issues, because they do not share the same designs or dates of issue.

Joint issue

An early unrealized trans-Atlantic joint issue

1914 peace commemoratives: In 1914, the United Kingdom, the Dominion of Canada and the United States agreed on a plan by which each of the three nations would issue its own series of stamps that year to commemorate the 100 years of Anglo-American peace that had prevailed since the end of the War of 1812. After the outbreak of World War I later that year, however, the UK and Canada deemed it inappropriate to issue peace stamps and withdrew from the project. The US had already produced essays for 2¢ and 5¢ stamps but canceled further plans for the designs. (This would not have been a true joint issue because each country would have designed its stamps individually.)

Joint issue

Australia

The Australia Post has collaborated several times with the postal administration of another country to release a joint issue.

Joint issue

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Austria

The Austria Post has collaborated several times with the postal administration of other countries to release joint issues.

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Belgium

The Belgium Post has collaborated several times with the postal administration of other countries to release joint issues.

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Berlin

Deutsche Bundespost Berlin of West Berlin prior to German reunification in 1990 had released the following joint issues.

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Brazil

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Bulgaria

Bulgarian Posts of the Republic of Bulgaria have released the following joint issues:

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Canada

Canada Post has released the following joint issues. The United States Postal Service has been Canada Post's most prolific philatelic partner.

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Chile

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People's Republic of China

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Croatia

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Cyprus

The Cyprus Postal Services of the Republic of Cyprus has released the following joint issues.

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Czech Republic

Česká pošta of the Czech Republic has released the following joint issues.

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Denmark

Post Danmark has collaborated a number of times with other postal administration to release joint issues.

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Ecuador

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Estonia

The Estonian Post Office has collaborated a number of times with other postal administration to release joint issues.

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Finland

Posti has collaborated a number of times with other postal administration to release joint issues.

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France

The French Post Office has collaborated with the postal administration of other countries to release several joint issues.

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French Southern and Antarctic Territories

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Gambia

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German Democratic Republic

Deutsche Post of the German Democratic Republic prior to German reunification in 1990 had released the following joint issues..

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Federal Republic of Germany

Deutsche Post, and its predecessor Deutsche Bundespost prior to German reunification in 1990, collaborates with the postal administrations of other countries to release joint issues on a regular basis.

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Greece

Hellenic Post (ELTA) begun releasing joint issues with other countries in 1999.

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Greenland

Post Greenland has collaborated a number of times with other postal administration to release joint issues.

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Hong Kong

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Hungary

Magyar Posta has collaborated a number of times with other postal administration to release joint issues.

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Iceland

Íslandspóstur has collaborated a number of times with other postal administration to release joint issues.

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India

India Post has collaborated a number of times with the postal administration of other countries to release a joint issue. India Post has released 32 Joint issues until Mar 2023.

India Post planned joint issues that did not materialize.