Book excerpt: This book joins an international and interdisciplinary group of leading experts on the biomedical, energy and environmental applications of Metal-Organic Frameworks (MOFs). The resulting overview covers everything from the environmentally friendly and scale up synthesis of MOFs, their application in green energy generation and storage, and water purification to their use as drug delivery systems, biosensors, and their association with relevant macromolecules (genes, enzymes). This book is focused on the interest of MOFs in applications such as the leading –edge environmental (energy-related) and biomedical fields. The potential of MOFs in these areas is currently progressing at a fast pace, since the wide possibilities that MOFs offer in terms of composition, topology, incorporation of active species (in their porosity, on their external surface or within the framework), and post-synthetic modifications, among others. The aim here is to provide future research goals that emphasize relevant nuances to this class of materials as a whole.