Latumian Laskar, Shebul Ahmed and Putul Ahmed were arrested from Borkhola town in Cachar district late last night.
The main accused in the case, Dibyendu Shekhar Kar, who is also a lawyer, was arrested on August 15 from Borkhola. Kar is currently in police custody.
Several prominent organisations and NGOs had staged protests in the last few days to demand arrest of the four accused.
The girl, a student of Silchar Women's College and hailing from Guwahati, was forcibly picked by the four men and taken to Kumbhirgram airport road in Silchar and raped on August 11, police said.
The accused had threatened of dire consequences if she reports to the police. She had filed an FIR at the Silchar police station on August 14 after her mother and sister arrived from Guwahati.