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.
The Australian Post Office has collaborated several times with the postal administration of another country to release a joint issue.
The Austria Post Office has collaborated several times with the postal administration of other countries to release joint issues.
The Belgium Post Office has collaborated several times with the postal administration of other countries to release joint issues.
Bulgarian Posts of the Republic of Bulgaria have released the following joint issues:
Canada Post has released the following joint issues. The United States Postal Service has been Canada Post's most prolific philatelic partner.
The Cyprus Postal Services of the Republic of Cyprus has released the following joint issues.
Česká pošta of the Czech Republic has released the following joint issues.
Post Danmark has collaborated a number of times with other postal administration to release joint issues.
The Estonian Post Office has collaborated a number of times with other postal administration to release joint issues.
Posti has collaborated a number of times with other postal administration to release joint issues.
The French Post Office has collaborated with the postal administration of other countries to release several joint issues.