The Federal Department of Home Affairs (FDHA, German: Eidgenössisches Departement des Innern, French: Département fédéral de l'intérieur, Italian: Dipartimento federale dell'interno, Romansh: ) is a department of the federal administration of Switzerland. Since 2024, it is headed by Federal Councillor Élisabeth Baume-Schneider.

Like the other federal departments, the FDHA is composed of a General Secretariat, several Federal Offices, and a number of other and affiliated administrative entities.

The General Secretariat is responsible for planning, coordination and controlling, and coordinates the decision-making process between the federal offices and the Head of Department. It provides consultancy services for the entire department. Its legal service is also responsible for supervising charitable foundations.