This book aims to provide a comprehensive description of the background theory, methods, models, applications and analysis of the discipline of wind resource assessment. The topics to be included are: climate variability, measurement, wind distributions, numerical modelling, statistical modelling, reanalysis datasets, applications in different environments (onshore and offshore), prediction accuracy, wind atlases and future climate. There are books that present specific aspects related to the area of wind resource, e.g. boundary layer meteorology, computational fluid dynamics models. However, there is the need for a comprehensive text that brings together the different aspects of wind resource assessment in one place. It should serve as a reference to anyone who wishes to understand the underlying science, the models or the application.