The Hackathon for assisted living, health, social care and community 2016 is the fourth event in its series organised jointly by the Vir.AL research group and by DS-Cubed in association with local councils and health organisations. We are looking for proposals to develop applications which will help with problems in health, assisted living, social care and communities. This applications could be in the form of a mobile app, a web application, stand-alone applications or games.