Glasgow University Union (GUU) is one of the largest and oldest students' union

Students' union

A students' union, student government, student senate, students' association, guild of students or government of student body is a student organization present in many colleges and universities, and has started appearing in some high schools...

s in the UK, serving students and alumni of the University of Glasgow

University of Glasgow

The University of Glasgow is the fourth-oldest university in the English-speaking world and one of Scotland's four ancient universities. Located in Glasgow, the university was founded in 1451 and is presently one of seventeen British higher education institutions ranked amongst the top 100 of the...

 since 1885.

The GUU organises social affairs for its members, provides value catering and entertainments and generally seeks to enhance the experience of its members during their time at the University of Glasgow and beyond. Students are eligible to become members for free at any point throughout their University career and alumni may become Life Members by applying to the Board of Management.
Students at the university instituted the idea of a union building in 1885 to help promote social interaction on campus.