Holy Trinity Parish, established in 1974 to serve the residential areas of Donaghmede, Clongriffin, and Balgriffin, is a vibrant community hub. Beyond its primary role as a place of worship, the parish facilitates a wide array of volunteer-led social, youth, and support groups, including the Society of St. Vincent de Paul. It is instrumental in local infrastructure development, supporting schools and community facilities, and provides comprehensive sacramental preparation and pastoral care.