The Postal Union of the Americas, Spain and Portugal (; ; UPAEP) is a regional association of the postal authorities in Latin America, portions of the Caribbean, the United States, Canada, Spain, and Portugal, and is headquartered in Montevideo, Uruguay. It was founded in 1911 as a restricted union of the Universal Postal Union.
The UPAEP's predecessors include:
The South American Postal Congress () was held on 8 January 1911 with delegates from Argentina, Bolivia, Brazil, Chile, Ecuador, Paraguay, Peru, Uruguay, and Venezuela. The union was later renamed the Panamerican Postal Congress () in 1926, the American-Spanish Postal Congress () in 1936, the Postal Union of the Americas and Spain () in 1966, and the Postal Union of the Americas, Spain and Portugal in 1990.
The Postal Union of the Americas, Spain and Portugal consists of the following member postal administrations: