Holy Trinity Senior National School was founded in September 1973 in Donaghmede. The school was opened as a result of urban sprawl in the area leading to the building of many housing estates in what had been a previously grassy area of land in Dublin. As Donaghmede grew, the need for more community based facilities also grew. The first school in Donaghmede opened on Monday 4th of September 1972 with 6 teachers and approximately 270 pupils. This school would be a junior school that would serve pupils from Junior Infants to 2nd Class and was hosted in temporary accommodation in Grange Park. Due to the high numbers the school operated with a dual day system with 2 classes occupying prefabs from 9am to 12 noon and 2 other classes occupying these same prefabs from 12.30pm to 2.30 pm. The principal of the school was Mr. Bill O’Brien who would go on to become the first principal of Holy Trinity SNS the following year.
Holy Trinity SNS opened in September 1973. Holy Trinity would host pupils from 3rd Class to 6th Class. It grew quickly with class sizes reaching as far as 50 pupils. As Holy Trinity grew it would adopt some great initiatives. Our Parents Association was set up in 1983 which would help with many aspects of running a school including fundraising, hosting events and running programmes. Homework Club and Breakfast Club would provide great resources for the school while the Rainbows programme would assist pupils dealing with bereavements. Being active was an important part of our school with Athletics and GAA becoming popular with our pupils. The creative arts was also an important aspect of our school life with focus being plaved on art, music and drama. The pupils of Holy Trinity loved gardening and our garden even featured on Ireland AM. The school would go on many trips including school tours, historical tours and trips to other parts of the country.
Presently our school has over 400 pupils. The school has made many improvements to the school building over the years as we added new classrooms and opened our Le Chéile building. We have grown with the modern times adding many IT services to the school including interactive classroom screens, laptops and iPads. We have a wide range of extra curricular activities including variety club, guitar club, basketball club, GAA, soccer, boxing, coding club, knitting club and yoga.