The decision was taken at a syndicate meeting on Saturday, said the university’s Registrar Abu Bakr Siddique.
“The five students, who had earlier been suspended, have now been expelled from the university for life,” he said.
A female student of the university had alleged of being sexually harassed on campus during the Pahela Baishakh celebrations on Apr 14.
She identified the assaulters as members of Bangladesh Chhatra League (BCL), the ruling Awami League’s student affiliate.
She said they were returning to the residential hall after a programme of her department at the Botanical Garden.
Five students of Shaheed Salam-Barkat Hall stopped them at the Chourangi intersection, she said.
They tried to take her to a bush and beaten up her friend, she alleged.
They left when the victims shouted out for help.
The BCL had expelled the five accused for the “sake of neutral investigation” after the university had suspended them.
On Saturday, the accused were expelled from the university for life.
They are – the university BCL working committee member and 42nd batch journalism student Nishat Imtiaz, Shaheed Salam-Barkat Hall unit publicity secretary and 42nd batch chemistry student Nafis Imtiaz, anthropology student Abdur Rahman Ifti, geology student ‘Rakib’, and history’s Nurul Kabir.