This is an investigator-initiated, multinational, retrospective, non-interventional pilot study conducted in five haemophilia treatment centres from different geographical regions that maintain a local (Algeria, Malaysia) or national (India, Iran, South Africa) haemophilia registry. Data from a randomly selected sample of patients from national or local registries are anonymously collated and analysed.The aims are to determine the feasibility of combining data from national and local registries in countries with developing healthcare systems and to assess how existing registries implemented current recommendations for data collection in terms of available fields and their completion.