The Federal Department of Environment, Transport, Energy and Communications (DETEC, German: Eidgenössisches Departement für Umwelt, Verkehr, Energie und Kommunikation, French: Département fédéral de l'environnement, des transports, de l'énergie et des communications, Italian: Dipartimento federale dell'ambiente, dei trasporti, dell'energia e delle comunicazioni, Romansh: Departament federal per ambient, traffic, energia e communicaziunⓘ) is one of the seven departments of the Swiss federal government, headed by a member of the Swiss Federal Council.

The department is composed of the following offices:[2] The following independent authorities are affiliated to the DETEC for administrative purposes: