​The combination of metal organic frameworks (MOFs) and polymers in the form of mixed matrix membranes (MMMs) has become an increasingly important field of research over the last few years. The first examples of membranes outperforming state of the art polymers have already been presented, emphasizing the high application potential of these composites. In this paper, the recent progress on the topic is thoroughly reviewed and the main advantages and limitations of the use of MOFs as MMMs fillers are evaluated.