AbstractMetal-organic frameworks (MOFs) represent a novel class of materials that are the subject of intense research efforts due to their potential technological applications. Although major efforts are being pursued in improving their adsorption properties, the use of open shell metal centers can add magnetic properties to the frameworks, thus making them suitable targets for the design of multifunctional materials. In this review, we present a summary of the recent advances in the field of spin-crossover frameworks (SCOFs), with emphasis on the guest effect over the magnetic properties of the MOF material. This review is organized as follows: First, an introduction to metal-organic frameworks and the spin-crossover phenomenon is presented. Second, we discuss previously reported SCOFs and examine how chemical modifications of the framework and the host/guest interactions affect their physical properties. Finally, an outlook on future applications of SCOFs is discussed.