This article reports on the role of an online knowledge hub in supporting the development of policy and practice relevant to children and families affected by parental offending. The authors use a case study of the i-HOP service, a national web-based collection of resources that supports professionals to work with children and families affected by parental offending. Delivered by the national children’s charity Barnardo’s, the knowledge hub provides a comprehensive collection of research and evidence, policy frameworks, practice examples, funding opportunities and training resources (https://www.i-hop.org.uk). The article begins by considering the rationale behind the development hub, including an increase in the number of children and families affected by parental offending, unsystematic policy response and limited resources for practitioners working with children and families. Next, the article discusses the development of the hub, including the challenges encountered and practical solutions employed. The implementation of a quality assessment system to support policy-makers and practitioners to make informed judgements about the suitability and quality of research and evidence deposited on the hub is also considered. The article concludes with practical suggestions for organisations that are contemplating the development of a knowledge hub to bridge the gap between research and evidence and practice and policy.