The Regeln für die alphabetische Katalogisierung or RAK (also known as Regeln der alphabetischen Katalogisierung, translating as: Rules for alphabetical cataloging) are a bibliographic cataloging set of rules. The RAK rules appeared for the first time in 1976 and became the dominant set of rules in Germany and Austria in the 1980s.
The theoretical model on which the RAK rules were based on are the "Paris Principles" (PP), drawn up in 1961 at a conference of the International Federation of Library Associations and Institutions (IFLA). The International Standard Bibliographic Description (ISBD), which has existed since 1971, formed the further basis for the RAK.