The voting started at 8.30 a.m. across 117 booths set up at 51 colleges of Delhi University.
The elections for the morning colleges started at 8.30 a.m. and will end at 12.30 p.m. while the elections for the evening colleges will start at 3 p.m. and end at 7 p.m.
According to the Chief Election Commissioner for DUSU polls, a total of 17 candidates are in fray for the four posts of Delhi University Students' Union office-bearers.
Seven candidates are in race for the post of President and four for the post of Vice-President. Three contestants each are in fray for the Secretary and Joint Secretary post.
The votes will be counted on Saturday and the results declared on the same day.
The Akhil Bharatiya Vidyarthi Parishad (ABVP), affiliated to the Rashtriya Swayamsevak Sangh (RSS), swept all the four posts by huge margins in last year's elections.
Last year, ABVP defeated Chhatra Yuva Sangharsh Samiti (CYSS), affiliated to the Aam Aadmi Party (AAP), National Students' Union of India (NSUI), affiliated to Congress and All India Students' Association (AISA), affiliated to the Communist Party of India.
Amit Tanwar is the ABVP presidential candidate this year.
The NSUI has fielded first-year LLB student Nikhil Yadav as its presidential candidate. The AISA's presidential candidate is Kawalpreet Kaur, who is also a law student.
The CYSS is not contesting this year. It was unable to win any seat last year during it first contest in the DUSU elections.