The Delhi University Students Union (DUSU) is the students' union at the University of Delhi. It is the representative body of the students from member colleges and university faculties & teaching departments. The students of member colleges and university faculties & teaching departments are the members of the Union. The Vice-Chancellor of the University of Delhi is the Patron of the Union. The official year and term of the Union is from 16th of August of every year to the 15th of August, of the following year.

DUSU has a budget of approximately Twenty Four lakhs INR. Every member of Union pay Twenty INR as annual subscription to Union funds which is collected along with the fees collected at the time of admission by the respective College/Institutions.

Elections to Union are held by direct voting by the students of the university faculties & teaching departments and member colleges. Member colleges and university faculties have their own College or Faculty Students' Union. The DUSU is a university-level umbrella organisation for university faculties and member colleges Students' Unions. The DUSU has four office bearers: President, Vice President, Secretary and Joint-Secretary. DUSU also includes 1 or 2 Central Councillor(s) from each college affiliated to DUSU. C.C. are directly elected by the college. The President of each college affiliated to DUSU is also a member of the central council of DUSU.

The elections are usually held in July - August of each year. As of 2019 there are total of 52 Delhi University colleges & faculties affiliated to DUSU.

DUSU elections is said to be world's largest election for a students' union.