This European Respiratory Society (ERS) / European Reference Network (ERN-LUNG) collaborative course will present the latest understanding and advice on the management of rare lung diseases. Due to the small number of people affected with rare lung diseases, diagnosis can be difficult and treatment options are limited. This online course will provide an overview on how to diagnose and treat rare lung diseases, including interstitial lung diseases, pulmonary hypertension, cystic fibrosis, primary ciliary dyskinesia, non-cystic fibrosis bronchiectasis, rare obstructive lung diseases and rare thoracic cancers. Participants will benefit from round table discussions, case-based sessions, and the opportunity to present their pre-recorded cases and discuss them with leading experts.