This atlas encompasses the spectrum of nail disorders and intends to provide an up-to-date and highly illustrated synopsis of both common and rare conditions. The diseases included are of infectious, inflammatory, neoplastic, and traumatic etiologies, and include both adult and pediatric conditions. There is an emphasis on images spanning a range of Fitzpatrick skin types, to demonstrate the similarities and differences in presentation of nail diseases in light, medium, and dark skin. Atlas of Nail Disorders Across All Skin Colors is not only an important tool for dermatologists in practice or in training but also for physicians in fields such as internal medicine, primary care, pediatrics, and surgery who often see patients with nail conditions as part of their day-to-day practice.