The highest-ranking and oldest institution in Ireland, Trinity College Dublin has an international reputation for academic excellence. It remains at the cutting edge of research, technology, and innovation, and offers its students unparalleled academic opportunities. Courses at Trinity are taught by faculty who are leaders in their fields, and offer small group tutorials, seminars and experiential learning opportunities in addition to lectures.

Following the CASA-Dublin orientation program, entitled Understanding Ireland , participants immerse themselves in regularly-offered Trinity College courses beside local students. Trinity has an extensive undergraduate course catalogue, with a diversity of course options available to CASA students that span a multitude of academic departments in the Faculty of Arts, Humanities and Social Sciences, the Faculty of Health Sciences, and the Faculty of Engineering, Maths and Sciences. As part of their curriculum, students have the option to partake in the award-winning Idea Translation Lab (ITL), a cutting-edge, cross-disciplinary undergraduate course that allows them to explore the modern-day intersection of science and art, and develop solutions to real-life problems. Participants also have the option to select one graduate Masters-level course from a variety of disciplines, subject to approval, as part of their course selection.

The standard semester academic load at Trinity College Dublin is 30 ECTS credits, with most courses counting for either 5 or 10 ECTS credits. All CASA students must enroll in courses totaling a minimum of 30 ECTS credit per semester to receive full academic credit.