Trinity College Dublin Students' Union

Trinity College Dublin Students' Union (Irish: Aontas Mac Léinn Choláiste na Tríonóide), often referred to by its abbreviation TCDSU, is a students' union and the recognised representative body for the students of Trinity College Dublin. Its role is to provide a channel between the students and the authorities of the college, as well as to provide services to those students. TCDSU is a constituent organisation of the Union of Students in Ireland.

The day-to-day business of the Union is run out of Teach 6, also known as Teach Mandela. The union is led by a team of sabbatical officers with the help of part-time officers, faculty convenors, school convenors and class representatives, alongside a number of permanent staff members.

Structure
The union has a complex governance structure, including six sabbatical officers, three faculty convenors and thirteen part-time officers. There are also representatives from the college's various schools and courses who assist with policy development, campaigns and student casework. There are also two commissions designed to hold officers accountable: the Electoral Commission (responsible for elections) and the Oversight Commission (responsible for mandate compliance).

As of 2024, there were six sabbatical officer positions: the president, the education officer, the welfare & equality officer, the communications & marketing officer, the entertainments officer and the oifigeach na Gaeilge, the latter of which was introduced in February 2024. As is common in other students' unions, TCDSU's sabbatical officers take an intermission of their studies and receive a salary from the union while serving in their roles, but this not the case for any other roles in the union. Elections for sabbatical officers are held every spring, with all capitated students (including incumbent sabbatical officers) eligible to run and vote.

The president, the education officer and the welfare & equality officer are elected members of the college board. The education officer and the three faculty convenors are also elected members of the University Council.

Campaigns
The union runs a number of campaigns, both at the college level and at the national level. As part of this, the union's officers organise various campaign weeks throughout the year addressing issues like mental health, gender equality and climate change. TCDSU has also been part of lobbying the Irish Government over issues such as the re-introduction of third-level fees and has campaigned against decisions made by the college considered unfavourable to students.

Previous campaigns have included providing students with information on abortion services (at the time illegal in Ireland) and organising an encampment outside the Book of Kells to pressure the college into divesting from Israeli companies which operate in the Palestinian territories.

Trinity Ents
The union's entertainments officer is responsible for running social events catered to students' interests. For example, Trinity Ents is responsible for the annual Trinity Ball, Europe's largest private music party annually drawing 8,000 party-goers. It is a May Ball in the style of the Cambridge colleges with an emphasis on live music. The ball is run in conjunction with Trinity's Central Societies Committee and event promoters MCD Productions. The ball has previously hosted acts such as The Kooks, Dizzee Rascal, Calvin Harris, Mark Ronson, Justice, and Babyshambles and celebrated its 50th anniversary in 2009.

The University Times
A student newspaper, The University Times, is funded by the Students' Union. The editor of the University Times is elected in the same way as the sabbatical officers of the union, however they themselves are not a union officer and maintain their editorial independence. Like the sabbatical officers, however the editor of the University Times takes an intermission of their studies and receives a salary from the union while in the position.

The University Times has received a number of awards, including Newspaper of the Year 2022 at the National Student Media Awards.

Notable former officers

 * Averil Power - CEO of the Irish Cancer Society, former union president and education officer
 * Ivana Bacik - Leader of the Labour Party, former union president
 * Joe Duffy - Radio and TV presenter for RTÉ, former union president
 * Lynn Ruane - Senator, former President
 * Mark Little - Journalist and TV presenter for RTÉ, former union president