The Federal Office for Customs and Border Security (FOCBS) (German Bundesamt für Zoll und Grenzsicherheit (BAZG); French Office fédéral de la douane et de la sécurité des frontières (OFDF); Italian Ufficio Federale della dogana e della sicurezza dei confini (UDSC); Rhaeto-Romanic Uffizi federal de la duana e de la segirezza dals cunfins (UDSC)) is a federal agency of the Swiss Confederation.

The FOCBS experts check whether the goods have been registered correctly, set taxes and duties, and ensure compliance with regulations to protect the population and the economy.

The Federal Office of Customs and Border Security is not only responsible for Switzerland but also for the German municipality and exclave of Büsingen am Hochrhein and the Principality of Liechtenstein.

Until the end of 2019, the Italian municipality and exclave of Campione d'Italia was also a de facto Swiss customs area.

In addition to process simplification and digitization, the legal basis will also be adjusted (total revision of the customs law).