The Official Compilation of Federal Legislation (AS) (German: Amtliche Sammlung des Bundesrechts, AS; French: Recueil officiel du droit fédéral, RO; Italian: Raccolta ufficiale delle leggi federali, RU) is the federal government gazette of Switzerland. All Swiss federal laws and ordinances, as well as amendments to them, enter into force by chronological publication in the AS/RO/RU.
Federal laws only become legally binding when published in the Official Compilation, as opposed to the Systematic Compilation of Federal Legislation, which by itself does not confer force of law (art. 8 PublA).
It is issued in the three official languages of Switzerland: German, French and Italian, and regulated by the Publications Act. All three language editions are equally valid. It is published by the Federal Chancellery of Switzerland in the form of weekly supplements to loose leaf binders. Since 1999, they have been also made available on the Internet in PDF format.