St. Georgen am Längsee (Slovene: Šentjurij ob Dolgem jezeru) is a municipality in the district of St. Veit an der Glan in Carinthia, Austria.

The municipal area comprises the cadastral communities of Goggerwenig, Gösseling, Launsdorf, Osterwitz, and Taggenbrunn as well as famous Hochosterwitz Castle in the south.

The settlement arose from the former St. Georgen monastery of Benedictine nuns established about 1002/08 by the local Countess Wichburg, a granddaughter of the Bavarian duke Eberhard.

Rebuilt in a Baroque style, it was dissolved by order of Emperor Joseph II in 1783.

Seats in the municipal assembly (Gemeinderat) as of 2009[update] elections: St. Georgen is twinned with: This Carinthia location article is a stub.