This book provides a state-of-the-art update on precision medicine in Interstitial Lung Diseases (ILD). This is a rapidly evolving and growing field. There have been multiple recent manuscripts and reviews on this topic although each of these only includes certain aspects of precision medicine in ILD. The aim of this book is to aggregate this information into a single volume. In the introduction, precision medicine is broadly defined in the context of ILD. Subsequent chapters highlight various aspects of precision medicine including genetic biomarkers, exhaled breath biomarkers, use of big data in precision medicine in ILD and influences of environment and ethnicity. The book concludes with a chapter focused on the future of precision medicine in ILD, highlighting goals and potential obstacles as the field advances. This book is a helpful guide for both clinicians and those involved in ILD research and development.