Catalysis by tin has been a longstanding area of research and industrial development in the oil refining and fine chemicals sectors. Recent years have witnessed the emergence of new technologies driven by the incentive to develop greener/sustainable processes of industrial relevance. The transformation of renewable feedstocks to chemicals, polymers and energy vectors is challenging especially where selectivity is concerned. Tin catalysts can address these issues considering its redox and Lewis-acid properties. This chapter emphasises case studies in heterogeneous and homogeneous catalysis where tin brings an advantage.