Stamps & Post
- CASCO Philatelic Services
- Fédération Internationale de Philatélie (FIP)
- International stamp collectors and philatelists society.
- Olympic Philately, Numismatic and Memorabilia Commission
- The Olympic Philately, Numismatic and memorabilia Commission is responsible for advising the IOC on the dissemination of the Olympic ideal through the worldwide promotion of stamps, coins and items commemorating the Olympic Games.
- Postal addressing systems
- Outlines the elements that form the basis for proper postal addressing. These elements ensure the correct wording of addresses for worldwide destinations and guarantee the quick and efficient handling of letter-post items.
- Postal contacts for international customers
- United Nations Postal Administration
- United Nations Postal Administration Vienna Office
- Universal Postal Union
- Established in 1874, the Universal Postal Union (UPU), with its headquarters in the Swiss capital Berne, is the second oldest international organization worldwide.