Gaisberg is a mountain to the east of Salzburg, Austria. It belongs to the Osterhorngruppe (a part of the Limestone Alps) between the Lammertal valley and the Wolfgangsee. A public bus route starting from the Mirabellplatz square links the popular destination for winter sport, hiking, mountain biking, and paragliding to the city centre. A 100 m high FM and TV transmitter facility, the Gaisberg Transmitter, which was built in 1956, is located on its top.