This textbook is the result of joint efforts between EULAR and the Pediatric Rheumatology European Society (PReS). It is inspired by the EULAR Online Course on Paediatric Rheumatology. Written by leading European paediatric rheumatologists, the textbook offers an in-depth analysis of all aspects of this specialised area relating to rheumatic diseases in children and adolescents, as well as the impact of the diseases on the growing body. It also looks at the differential diagnosis of other paediatric disorders. This textbook is an essential reference for paediatricians, rheumatologists and all professionals involved in the care of children with rheumatic conditions.