The incident took place in Nangloi area late last night and the trio -- Anwar (30), a property dealer, Sandeep (32), a mobile shop owner, and Anish (35), a guard, were arrested.
The girl had gone out for a walk after dinner when the trio kidnapped her in a car and raped her, police said.
The accused dumped the girl near her house this morning, a senior police official said, adding that she narrated the incident to her family members, who approached police.
The girl told the police that the attackers were not known to her. Medical examination has confirmed sexual assault, police said.