Organizations must gain insights into often fragmented and isolated data assets and overcome data silos to profitably leverage data as a strategic resource. Data catalogs are an increasingly popular approach to achieving these objectives. Despite the perceived importance of data catalogs in practice, relatively little research exists on how to design corporate data catalogs. It is also obvious that the existing market solutions have to be customized to the specific organizational needs. This paper presents a list of functional requirements for enterprise data catalogs extracted from a systematic literature review. The requirements can be used to frame and guide more specific research on data catalogs as well as for system selection and customization in practice.