Portmarnock Community School, also known as Pobal Scoil Phortmearnóg, is a co-educational school dedicated to providing comprehensive secondary education to students. Founded in 1979 by the Department of Education and Science, the school's mission is to ensure equal educational opportunities for all its students. Portmarnock Community School follows an educational policy that promotes the holistic development of each individual.

The school focuses on fostering religious, social, physical, and intellectual growth in an integrated manner. As a school established under the Deed of Trust for Community Schools, it serves the Portmarnock community and its surrounding areas. The school has joint patronage, with the Archbishop of Dublin, the Loreto Sisters, and the County Dublin Vocational Education Committee.

It prides itself on creating an inclusive and respectful environment, where students from all backgrounds are valued members of the community. Portmarnock Community School offers a wide range of academic and extracurricular activities, including music, sports, public speaking, and debating. The school also provides guidance and counseling services, with dedicated teachers and posts to support students throughout their educational journey.

With a commitment to excellence and a focus on the whole person, Portmarnock Community School is dedicated to preparing students for active participation in their families, communities, and beyond