In a global context which promotes the use of explicit semantics for sharing information and developing new services, the MAchine Readable Cataloguing (MARC) format that is commonly used by libraries worldwide has demonstrated its many limitations. The conceptual reference model for bibliographic information presented in the Functional Requirements for Bibliographic Records (FRBR) is expected to be the foundation for a new generation of catalogs that will replace MARC and the digital card catalog. The need for transformation of legacy MARC records to FRBR representation (FRBRization) has led to the proposal of various tools and approaches. However, these projects and the results they achieve are difficult to compare due to lack of common datasets and well defined and appropriate metrics. Our contributions fill this gap by proposing BIB-R, the first public benchmark for the FRBRization process. It is composed of two datasets that enable the identification of the strengths and weaknesses of a FRBRization tool. It also defines a set of well defined metrics that evaluate the different steps of the FRBRization process. Those resources, as well as the results of a large experiment involving three FRBRization tools tested against our benchmark, are available to the community under an open licence.