The Polish Post is the state postal administration of Poland, initially founded in 1558. The company is headquartered in Warsaw and employs over 67,000 people. It is the largest mail-handling company in the country, which additionally provides courier, banking, insurance and logistics services. The digital services, such as neo-stamps, neo-letters and neo-postcards, are available through the Internet-based platform Envelo.

The Defence of the Polish Post Office in Danzig (Gdańsk) was one of the first acts of World War II in Europe, as part of the September Campaign. On 1 September 1939 the Invasion of Poland was initiated by Germany when the battleship Schleswig-Holstein opened fire on the Polish-controlled harbor of Danzig, around 04:45–48 hours. Danzig paramilitaries and police, supported by Germany, immediately joined the offensive to take full control of the city, by capturing the Polish post office. Polish personnel defended the building for some 15 hours against assaults by the SS Heimwehr Danzig, local SA formations and special units of Danzig police. All but four of the defenders, who were able to escape from the building during the surrender, were sentenced to death by a German court martial as illegal combatants on 5 October 1939, and executed.