Grotten (Norwegian: Grotto) is a nineteenth-century building (1823) located on the premises of the Royal Palace in the city centre of Oslo, Norway.
Grotten is an honorary residence owned by the Norwegian state.
The house is situated over a grotto on a rocky outcrop at the edge of Palace Park (Slottsparken).
Since the 1920s, it has been awarded as a permanent residence to a person specifically bestowed this honour by the King of Norway.
Residents at Grotten have included composer Christian Sinding, writer Arnulf Øverland, composer Arne Nordheim and playwright Jon Fosse.