Our research investigates which approaches to community engagement are likely to enhance trust between Gypsy/Travellers and mainstream health services. The focus is maternity services, early years’ health services and child dental health services. The objectives are to:describe activities and methods used to engage Gypsy/Travellers in health services and to assess the extent to which they focus on developing trust;investigate the extent to which different engagement activities used by health services enhance trust and increase uptake of maternity services, early years’ services and child dental health services by Gypsy/Travellers;examine the knowledge, attitudes/beliefs and experiences of Gypsy/Travellers of maternity services, early years’ services and child dental health services;identify different approaches to enhancing Gypsy/Travellers’ trust in maternity services, early years’ services and child dental health services and explore the implications for policy and practice;estimate the potential implementation costs of different approaches to enhancing Gypsy/Travellers’ trust in maternity services, early years’ services and child dental health services; andexplore whether community engagement approaches that work to enhance Gypsy/Travellers’ trust in maternity services, early years’ services and child dental health services are potentially applicable to other health services/vulnerable communities.