The Norwegian Institute for Defence Studies (, IFS) is a state defence research institute based in Oslo, Norway. It was established in 1980 and is part of the Norwegian Defence University College, a state university college that is both part of the Norwegian Armed Forces and the academic sector. https://web.archive.org/web/20120816054818/http://hogskolene.forsvaret.no/forsvarets-hogskole/Sider/forsvarets-hogskole.aspx.
It is a politically independent institute within the Norwegian Armed Forces. Its main activities are concentrated in the areas of research, teaching and dissemination.
It is divided into four Centres: Centre for Norwegian and European Security, Centre for Civil-Military Relations, Centre for Asian Studies and Centre for Transatlantic Studies. The current director of the IFS is Kjell Inge Bjerga, who will leave the position in 2025.