The development of environmentally benign and clean synthetic methodologies is still one of the most important goals of current research in chemistry. In this regard, catalysis and organometallic chemistry are key technologies to achieve these objectives and to contribute to a “greener” chemistry in the future. From its start, Topics in Organometallic Chemistry has been devoted to a significant extent to publishing volumes that go in this direction. The present issue also follows this track. More specifically it tries to give an overview of the current status and future trends of catalytic carbonylation reactions.