TERMDAT is the terminology database of the Swiss Federal Administration. TERMDAT contains Swiss legal and administrative terminology in the four official Swiss languages - German, French, Italian, and Romansh - and in English. The terms are recorded in thematic glossaries compiled in collaboration with experts from the Federal Administration or from the private sector.

TERMDAT is run by the Terminology Section of the Swiss Federal Chancellery.

TERMDAT contains some 400,000 Swiss entries - either verified or being processed - produced by the Federal Administration and by the Cantons of Bern, Fribourg, Valais and Graubünden.

The terms, abbreviations, titles of legislation, the names of Swiss and international authorities, institutions and organisations as well as other information held in the database originate primarily from federal legislation and pertain to a wide variety of fields (education, energy, finance, commerce, industry, culture, agriculture, defence, environment, transport, economics, etc).

The Federal Chancellery Terminology Section, which runs Termdat, has close links to foreign and international terminology institutions, in particular the specialists at IATE, the European terminology database, the Council for German-Language Terminology (RaDT) and the French terminology commissions.
It also works closely with several Swiss cantons (BE, FR, GR, VS), whose language services are affiliated in the Coordination Body for Terminological Cooperation in the Public Sector (CoTerm) and who assist in expanding the database. Specialist associations such as Computerm are also involved.