All DCU Students are automatic members of DCU Students' Union. 

DCU Students' Union provides a wide range of services, including : 

• Advice on employment opportunities while you're studying
• Bus / rail ticket sales and secretarial services
• An extensive programme of student entertainment on and off campus.
• Co-ordinates and expresses your views on all issues relating to students at DCU i.e. education, welfare and social and recreational matters.

There are twelve executive officers, three of whom are full time sabbatical officers, who are elected by the students. Each class has a number of elected representatives on Union Council also. These representatives sit on the Programme Boards as well.

Students are also represented by the Students' Union on various University decision-making committees, including the Governing Authority, Academic Council, Disciplinary Committee and Library Committee.