The rapid urbanisation process of the last century attributed to industrial revolution enabled the worldwide reproduction of infrastructure, products and urban morphologies. As a result, cities of today consume most of the world’s resources but also generate most of its waste. The exponential growth of digital technologies over the past decades is enabling a shift towards alternative patterns of consumption based on a global, distributed flow of data and a local flow of materials. This handbook outlines the key principles and ideas of this shift: The Fab City. It is many things at the same time: a milestone, a manifesto, a map, a guide, and simply a manual for making positive engaging urban futures possible.