University College Dublin Students' Union
| Institution | University College Dublin |
|---|---|
| Location | Old Student Centre, Belfield, Dublin |
| Established | 1975 |
| President | Michael Roche (as of 2025) |
| Membership | c. 30,000 (as of 2015) |
| Website | ucdsu |
University College Dublin Students' Union (UCDSU; Irish: Aontas na Mac Léinn COBÁC) is the students' union of University College Dublin. It is the largest students' union in Ireland.
The union was founded in 1975 as the successor of the Student Representative Council, with Enda Connolly acting as the organisation's first president. Its primary role is to represent its members views and defend their interests.
All students of UCD who are studying for a degree or postgraduate diploma of the National University of Ireland are, on registration at the university, members. In addition to its campaign work, the union also provides a number of welfare and education services and operates three shops.