Peer-supported open dialogue is a variant of the ‘open dialogue’ approach that is currently practised in Finland and is being trialled in several countries around the world. The core principle of the approach is the provision of care at the social network level, by staff who have been trained in family, systems and related approaches. These staff include peer workers, who will help to enhance the democratic nature of the meetings around which care is centred, as well as enabling such meetings to occur where networks are fragmented or lacking. Certain organisational and practice features and underlying themes are key to the approach. Crucially, open dialogue is also a system of service provision. Staff trained in peer-supported open dialogue from six National Health Service (NHS) trusts will launch pilot teams in 2016, as part of an intended national multicentre randomised controlled trial.