Interstitial lung disease (ILD) is a diverse group of illnesses with a variety of causes. The current approach to diagnosing ILD depends on the specific patterns observed on imaging studies (CT scan) and lung biopsy. There is increasing evidence that an individual’s genetics play a complex and important role in determining disease behaviour across different ILD subtypes. This study will examine whether common genetic risk factors predispose patients to different forms of ILD, influence treatment response, and predict prognosis. Investigating these genetic risk factors will improve our understanding of the biology that drives ILD and will help to develop a better system for ILD classification and diagnosis.