Sankt Jakob im Rosental (Slovene: Šentjakob v Rožu) is a town in the district of Villach-Land in the Austrian state of Carinthia.
The municipality borders on Slovenia in the south, and the northern boundary is formed by the Drau River. It lies in the western part of the Rosen valley.
According to the 2001 census 16.4% of the population are Carinthian Slovenes.
In the Carinthian Plebiscite of 1920, Sankt Jakob was one of the 17 Carinthian municipalities, where the majority of the population (54%) voted for the annexation to the Kingdom of Serbs, Croats and Slovenes (Yugoslavia).
Among the famous natives of the municipality were the Slovene philologists Matija Ahacel and Anton Janežič.