Henndorf am Wallersee, commonly named Henndorf, is a municipality of 5,025 inhabitants in the district of Salzburg-Umgebung in the state of Salzburg in Austria.
The town was first mentioned in 6th century.
Henndorf is located around 16 kilometres to the north-east of Salzburg, by the Wallersee lake. The municipality borders with Eugendorf, Neumarkt am Wallersee, Seekirchen am Wallersee, Köstendorf and Thalgau. It is divided into 9 Katastralgemeinden: the town of Henndorf and 8 villages:
Austrian writer, raised nine children, was born in Henndorf