Salzburg (Austrian German: [ˈsaltsbʊɐ̯k]; German: [ˈzaltsbʊɐ̯k] (audio speaker iconlisten); literally "Salt Fortress"; Austro-Bavarian: Soizbuag) is the capital and also a district of the Austrian state of Salzburg or Salzburgerland. The population is about 150,000 and is the 4th largest city of Austria.

Its most famous citizen was Wolfgang Amadeus Mozart. Another famous inhabitant of Salzburg was the physicist Christian Doppler who found the Doppler effect which was named after him.

The Salzach river crosses the city. The old town was adopted by the UNESCO as World Heritage Site in 1996. Known is Salzburg also for being one of the settings for the movie "The Sound of Music" which based on the musical by Richard Rodgers and Oscar Hammerstein.