The core activity of the Oscar Fritschi Foundation consists of supporting and promoting three main areas:
1. **Innocent people in need**: The foundation supports individuals who have fallen into a situation of need through no fault of their own, with financial resources or other forms of assistance.
2. **Archaeology in the canton of Zurich**: The foundation promotes archaeological projects and research in the canton of Zurich, particularly in connection with the region's history and culture.
3. **Military historical research**: The foundation supports research and publications in the field of military history, particularly with regard to Swiss history and Switzerland's role in international conflicts.
The foundation focuses on supporting projects and individuals active in these three areas.