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Focusing on applications in separation, adsorption and catalysis, this handbook underlines the importance of this hot and exciting topic. It provides an excellent insight into the synthesis and modification of MOFs, their synthesis on an industrial scale, their use as CO2 and chemical warfare adsorbers, and the role of defects in catalysis. In addition, the authors treat such new aspects as biocatalysis and applications in photocatalysis and optoelectronic devices.Focusing on applications in separation, adsorption and catalysis, this handbook underlines the importance of this hot and exciting topic. It provides an excellent insight into the synthesis and modification of MOFs, their synthesis on an industrial scale, their use as CO2 and chemical warfare adsorbers, and the role of defects in catalysis. In addition, the authors treat such new aspects as biocatalysis and applications in photocatalysis and optoelectronic devices. Summary Enzymes are powerful biocatalysts due to their high efficiency; region?, stereo?, and chemoselectivity; and environmentally friendly behavior. However, their high cost and poor stability, together with the impossibility to reuse them in homogeneous catalysis, are important drawbacks that could be solved either by producing high stable artificial enzymes or by immobilizing them on solid supports. Metal–organic frameworks (MOFs) have recently emerged as promising materials in this domain. Therefore, this chapter proposes an overview of enzymatic catalysis involving MOFs, from some examples of enzyme?biomimetic MOF catalysts to enzyme?immobilized MOFs, including immobilization strategies, examples of heterogeneous biocatalytic reactions, and other related applications in different fields.